Our People

neurosurgeon and residents

Our people are the heart of our program. From the reception desk to the exam room, from laboratory to diagnostic suite, from administration office to faculty office, you will find our people eager to help you become the best neurosurgeon you can be.

At Iowa, you will be exposed to some of the best clinicians, researchers, and teachers in our profession. We provide high-powered opportunities for you to learn career-long lessons from these dedicated professionals.

Chair and Department Executive Officer


The overarching mission of our Department of Neurosurgery is to provide our residents the finest academic neurosurgery training experience possible. It is our goal to identify and train graduating medical students who have the greatest potential to be the future leaders of academic neurosurgery. We are committed to providing these select individuals the highest quality surgical and scientific training available anywhere.

We have all the resources needed to achieve this objective. Our clinical service is large, growing, and well balanced. We have an outstanding faculty with internationally recognized clinical leaders in the major subspecialties of neurosurgery. The University of Iowa Hospitals and Clinics is superbly equipped with leading edge technologies, including extensive experimental instrumentation. Patients travel to our institution from throughout the region, elsewhere in the U.S., and around the world to receive their neurosurgical care. This provides an ideal patient population for residency training.

The University of Iowa College of Medicine is consistently ranked in the top ten nationally in NIH funding per faculty member, and this institutional research strength is particularly strong in areas critical to the future of neurosurgery. Trainees are integrated into the research planning and training regime immediately upon acceptance into our program. Each resident is integrated into a continuous scientific mentoring process. During the internship and first two years of neurosurgery residency, we explore a wide range of research opportunities. Each resident then chooses an internationally renowned research laboratory in which to spend two years of protected time dedicated to research training. The scope of research opportunities includes leading research laboratories throughout the United States and overseas. This unique experience provides the critical scientific foundation necessary to launch the trainee’s career in academic neurosurgery.

Iowa City is a wonderful place to work and live. It is the ideal environment for residents who wish to pursue their professional ambitions at the highest level, while at the same time enjoying the many benefits of living in a safe, affordable, and culturally rich university town.

Medical students with outstanding academic credentials, who are committed to becoming leaders in the field of academic neurosurgery, are welcome to visit our program, meet the residents and faculty, and apply for the residency program. Please see the institution’s GME home page for more information about Graduate Medical Education at the University of Iowa.

Matthew A. Howard, III, MD

Chair and Department Executive Officer

Department of Neurosurgery Faculty

Learn more about our faculty members.

Current Residents

Chief Residents (PGY-7)

Luyuan Li, MD

Scott Seaman, MD

Medical school: Pennsylvania State University College of Medicine
Undergraduate: Saint Francis University
Hometown: Sewickley, Pa.


Colin Gold, MD

Brian Park, MD

Medical school: University of Iowa Roy J. and Lucille A. Carver College of Medicine
Undergraduate: University of California, San Diego
Hometown: Anaheim, Cali.


David Christianson, MD

Mark Dougherty, MD

Medical school: University of Chicago Pritzker School of Medicine
Undergraduate: Duke University
Hometown: Austin, Texas


Nahom Teferi, MD

Medical school: Addis Ababa University College of Health Sciences
Post-doctoral scholar/fellowship in neurosurgery: University of Iowa Hospitals & Clinics
Hometown: Addis Ababa, Ethiopia

Timothy Woodiwiss, MD

Medical school: University of Washington School of Medicine
Undergraduate: Washington State University
Hometown: Moses Lake, Wash.                            


Michael Kritikos, portrait

Michael Kritikos, MD

Tyson Matern, portrait

Tyson Matern, MD

Medical School: University of Neveda, Reno School of Medicine
Undergraduate: University of Utah, Salt Lake City, Utah
Hometown: Bountiful, Utah

"During my interview day at the University of Iowa, it was clear that the neurosurgery program offered extremely well-rounded training with strong clinical, operative, and research experience. It was also clear that the residents and faculty at Iowa are a cohesive, friendly, and hard-working group that would provide excellent mentorship and collegiality. Overall, the program's vast resources and commitment to training future leaders in academic neurosurgery made Iowa the preferred choice for my residency training."


Anthony Marincovich, portrait

Anthony Marincovich, MD

Medical School: University of Iowa Roy J. and Lucille A. Carver College of Medicine

Clayton Rosinski, portrait

Clayton Rosinski, MD

Medical School: University of Illinois College of Medicine


Asad Lak, MBBS

Medical School: King Edward Medical University

(photo coming)

Katherine Jensen, MD


Marshall Holland, MD

Marshall HollandMedical school: Southern Illinois University School of Medicine

Undergraduate: University of Miami, Coral Gables FL

Hometown: Mendota IL

“The Department of Neurosurgery at the University of Iowa has allowed me and other residents to perform high level research with incredible collaborators within a high-volume, quick paced service in a community that is great to live in. This residency fully prepares you to excel in a busy clinical practice, achieve successful rigorous scientific inquiries, and develop teaching proficiencies.”

Clinical Interests

  • Deep brain stimulation
  • Trigeminal neuralgia
  • Neuromodulation
  • Endoscopic and minimally invasive neurosurgery
  • Stereotactic surgery
  • Brain tumors

Current Research Inquires

Neurovascular and Autonomic Effects of Spinal Cord Stimulation in Humans: A Potential Novel Treatment Paradigm for Restless Legs Syndrome
Intradural Spinal Cord Stimulation: Device Development, Animal Models, and Translation to Humans, Treatment Options and Outcomes in Trigeminal Neuralgia

Planned fellowships

January 2020-June 2020: Stereotactic and Functional Neurosurgery, University of Florida, Kelly Foote, MD
July 2020-June 2021: Stereotactic and Functional Neurosurgery, Oregon Health and Science University, Kim Burchiel, MD

Selected publications

Epidural Spinal Cord Stimulation: A Novel Therapy in the Treatment of Restless Legs Syndrome.

Holland MT, Rettenmaier LA, Flouty OE, Thomsen TR, Jerath NU, Reddy CG.

World Neurosurg. 2016 Aug;92:582.e15-582.e18. doi: 10.1016/j.wneu.2016.05.077. Epub 2016 Jun 3.

PMID: 27268311

Femoral vascular conductance and peroneal muscle sympathetic nerve activity responses to acute epidural spinal cord stimulation in humans.

Holwerda SW, Holland MT, Reddy CG, Pierce GL.

Exp Physiol. 2018 Jun;103(6):905-915. doi: 10.1113/EP086945. Epub 2018 May 5.

PMID: 29603444

Intradural Spinal Cord Stimulation: Performance Modeling of a New Modality.

Anderson DJ, Kipke DR, Nagel SJ, Lempka SF, Machado AG, Holland MT, Gillies GT, Howard MA 3rd, Wilson S.

Front Neurosci. 2019 Mar 19;13:253. doi: 10.3389/fnins.2019.00253. eCollection 2019.

PMID: 30941012

The cost-effectiveness of surgery for trigeminal neuralgia in surgically naïve patients: a retrospective study.

Holland M, Noeller J, Buatti J, He W, Shivapour ET, Hitchon PW.

Clin Neurol Neurosurg. 2015 Oct;137:34-7. doi: 10.1016/j.clineuro.2015.06.011. Epub 2015 Jun 18.

PMID: 26123528

Durotomy Surrogate and Seals for Intradural Spinal Cord Stimulators: Apparatus and Review of Clinical Methods and Materials.

Nagel SJ, Helland L, Woodroffe RW, Frizon LA, Holland MT, Machado AG, Yamaguchi S, Gillies GT, Howard MA 3rd, Wilson S.

Neuromodulation. 2019 Jan 11. doi: 10.1111/ner.12913. [Epub ahead of print]

PMID: 30632655

Liesl Close, MD

Medical school: Oregon Health & Science University School of Medicine

Undergraduate: Willamette University, Salem OR

Hometown: Eugene, OR

“Iowa has given me the opportunity and the tools necessary to pursue my dreams. I felt at home here.  The faculty, staff, and residents are great to work with. Iowa City is a gem.”

Clinical and research interests

  • Trauma
  • Spine

Selected publications

Acute Hydrocephalus Resulting from Neuromyelitis Optica: A Case Report and Review of the Literature.

Close LN, Zanaty M, Kirby P, Dlouhy BJ.

World Neurosurg. 2019 Sep;129:367-371. doi: 10.1016/j.wneu.2019.05.177. Epub 2019 Jun 11.

PMID: 31200081

Thoracic meningocele and cervical syringomyelia treated with ventriculoperitoneal shunt.

Close LN, Park B, Woodroffe RW, Hitchon PW.

World Neurosurg. 2019 May 29. pii: S1878-8750(19)31481-0. doi: 10.1016/j.wneu.2019.05.204. [Epub ahead of print]

PMID: 31152885

Genome-wide DNA methylation investigation of glucocorticoid exposure within buccal samples.

Braun PR, Tanaka-Sahker M, Chan AC, Jellison SS, Klisares MJ, Hing BW, Shabbir Y, Gaul LN, Nagahama Y, Robles J, Heinzman JT, Sabbagh S, Cramer EM, Duncan GN, Yuki K, Close LN, Dlouhy BJ, Howard MA 3rd, Kawasaki H, Stein KM, Potash JB, Shinozaki G.

Psychiatry Clin Neurosci. 2019 Jun;73(6):323-330. doi: 10.1111/pcn.12835. Epub 2019 Mar 28.

PMID: 30821055

Genome-wide DNA methylation comparison between live human brain and peripheral tissues within individuals.

Braun PR, Han S, Hing B, Nagahama Y, Gaul LN, Heinzman JT, Grossbach AJ, Close L, Dlouhy BJ, Howard MA 3rd, Kawasaki H, Potash JB, Shinozaki G.

Transl Psychiatry. 2019 Jan 31;9(1):47. doi: 10.1038/s41398-019-0376-y.

PMID: 30705257

Epigenetics of Delirium and Aging: Potential Role of DNA Methylation Change on Cytokine Genes in Glia and Blood Along With Aging.

Shinozaki G, Braun PR, Hing BWQ, Ratanatharathorn A, Klisares MJ, Duncan GN, Jellison SS, Heinzman JT, Nagahama Y, Close L, Sabbagh S, Dlouhy BJ, Howard MA, Kawasaki H, Cho HR.

Front Aging Neurosci. 2018 Oct 23;10:311. doi: 10.3389/fnagi.2018.00311. eCollection 2018.

PMID: 30405391

Volume of Brain Herniation After Decompressive Craniectomy in Patients with Traumatic Brain Injury.

Abode-Iyamah KO, Stoner KE, Close LN, DeVries Watson NA, Flouty OE, Grosland NM, Howard MA 3rd.

World Neurosurg. 2018 Oct;118:e414-e421. doi: 10.1016/j.wneu.2018.06.204. Epub 2018 Jul 2.

PMID: 30257297

Cortical spreading depression as a site of origin for migraine: Role of CGRP.

Close LN, Eftekhari S, Wang M, Charles AC, Russo AF.

Cephalalgia. 2019 Mar;39(3):428-434. doi: 10.1177/0333102418774299. Epub 2018 Apr 25.

PMID: 29695168

Mario Zanaty, MD

Medical school: Université Saint-Joseph Faculté de Médecine

Undergraduate: Université Saint-Joseph Faculté de Médecine

Hometown: Zahle, Lebanon

“High volume, high quality research, and an unheard-of level of support from the staff. I remind myself everyday how lucky I am to have matched here.”

Clinical and research interests

  • Cerebrovascular disease
  • Cognition
  • Delayed cerebral ischemia
  • Revascularization
  • Stroke

Awards and grants

T32 grant recipient (T32HL007344-40).

Selected publications

View all publications

Flow diversion versus conventional treatment for carotid cavernous aneurysms.

Zanaty M, Chalouhi N, Starke RM, Barros G, Saigh MP, Schwartz EW, Ajiboye N, Tjoumakaris SI, Hasan D, Rosenwasser RH, Jabbour P.

Stroke. 2014 Sep;45(9):2656-61. doi: 10.1161/STROKEAHA.114.006247. Epub 2014 Jul 22.

PMID: 25052318

Flow-diversion for ophthalmic segment aneurysms.

Zanaty M, Chalouhi N, Barros G, Schwartz EW, Saigh MP, Starke RM, Whiting A, Tjoumakaris SI, Hasan D, Rosenwasser RH, Jabbour P.

Neurosurgery. 2015 Mar;76(3):286-9; discussion 289-90. doi: 10.1227/NEU.0000000000000607.


Flow-diversion panacea or poison?

Zanaty M, Chalouhi N, Tjoumakaris SI, Rosenwasser RH, Gonzalez LF, Jabbour P.

Front Neurol. 2014 Feb 28;5:21. doi: 10.3389/fneur.2014.00021. eCollection 2014. Review.


Diverse Use of the WEB Device: A Technical Note on WEB Stenting and WEB Coiling of Complex Aneurysms.

Zanaty M, Roa JA, Dandapat S, Samaniego EA, Jabbour P, Hasan D.

World Neurosurg. 2019 Jul 10;130:201-205. doi: 10.1016/j.wneu.2019.07.027. [Epub ahead of print]


Flow diversion for complex middle cerebral artery aneurysms.

Zanaty M, Chalouhi N, Tjoumakaris SI, Gonzalez LF, Rosenwasser R, Jabbour P.

Neuroradiology. 2014 May;56(5):381-7. doi: 10.1007/s00234-014-1339-x. Epub 2014 Feb 18.


Methods and Devices for Posterior VPS Placement Surgery: 25 Years of Iterative Refinement.

Zanaty M, Roa JA, Piscopo AJ, Kritikos ME, Teferi N, Howard MA 3rd.

World Neurosurg. 2019 May 24. pii: S1878-8750(19)31425-1. doi: 10.1016/j.wneu.2019.05.148. [Epub ahead of print]

PMID: 31132499

Complications following cranioplasty: incidence and predictors in 348 cases.

Zanaty M, Chalouhi N, Starke RM, Clark SW, Bovenzi CD, Saigh M, Schwartz E, Kunkel ES, Efthimiadis-Budike AS, Jabbour P, Dalyai R, Rosenwasser RH, Tjoumakaris SI.

J Neurosurg. 2015 Jul;123(1):182-8. doi: 10.3171/2014.9.JNS14405. Epub 2015 Mar 13.


Safety of tirofiban and dual antiplatelet therapy in treating intracranial aneurysms.

Samaniego EA, Gibson E, Nakagawa D, Ortega-Gutierrez S, Zanaty M, Roa JA, Jabbour P, Hasan DM.

Stroke Vasc Neurol. 2019 Feb 3;4(1):36-42. doi: 10.1136/svn-2018-000192. eCollection 2019 Mar.

PMID: 31105977

The Wishbone: A Cranial Midline Localizing Device.

Zanaty M, Banu M, Flouty O, Grady S, Holland MT, Isaacs A, Kung D, Limbrick DD Jr, McKhann G 2nd, Nagahama Y, Zipfel GJ, Howard MA 3rd.

World Neurosurg. 2019 May 14. pii: S1878-8750(19)31320-8. doi: 10.1016/j.wneu.2019.05.046. [Epub ahead of print]

PMID: 31100521

Feasibility, safety, and changes in systolic blood pressure associated with endovascular revascularization of symptomatic and chronically occluded cervical internal carotid artery using a newly suggested radiographic classification of chronically occluded cervical internal carotid artery: pilot study.

Hasan D, Zanaty M, Starke RM, Atallah E, Chalouhi N, Jabbour P, Singla A, Guerrero WR, Nakagawa D, Samaniego EA, Mbabuike N, Tawk RG, Siddiqui AH, Levy EI, Novakovic RL, White J, Schirmer CM, Brott TG, Shallwani H, Hopkins LN.

J Neurosurg. 2018 May 1:1-10. doi: 10.3171/2018.1.JNS172858. [Epub ahead of print]


Cognitive and cerebral hemodynamic effects of endovascular recanalization of chronically occluded cervical internal carotid artery: single-center study and review of the literature.

Zanaty M, Howard S, Roa JA, Alvarez CM, Kung DK, McCarthy DJ, Samaniego EA, Nakagawa D, Starke RM, Limaye K, Al Kasab S, Chalouhi N, Jabbour P, Torner J, Tranel D, Hasan D.

J Neurosurg. 2019 Mar 29:1-9. doi: 10.3171/2019.1.JNS183337. [Epub ahead of print]

PMID: 30925474

C1-C2 Motion During C-MAC D-Blade Videolaryngoscopy and Endotracheal Intubation in 2 Patients With Type II Odontoid Fractures: A Case Report.

Hindman BJ, Woodroffe RW, Zanaty M, Kawasaki H, Yamaguchi S, Puttlitz CM, Gadomski BC.

A Pract. 2019 Mar 20. doi: 10.1213/XAA.0000000000001000. [Epub ahead of print]

PMID: 30907749

Mechanical Thrombectomy of Acutely Occluded Flow Diverters.

Samaniego EA, Dandapat S, Roa JA, Zanaty M, Nakagawa D, Hasan DM.

Oper Neurosurg (Hagerstown). 2019 Mar 20. pii: opz023. doi: 10.1093/ons/opz023. [Epub ahead of print]

PMID: 30892631

In vitro accuracy and inter-observer reliability of CT angiography in detecting intracranial aneurysm enlargement.

Al Kasab S, Nakagawa D, Zanaty M, Bathla G, Policeni B, Soni N, Allan L, Hudson J, Limaye K, Ortega-Gutierrez S, Samaniego EA, Hasan D.

J Neurointerv Surg. 2019 Mar 6. pii: neurintsurg-2019-014737. doi: 10.1136/neurintsurg-2019-014737. [Epub ahead of print]

PMID: 30842308

Letter by Hudson et al Regarding Article, "Clinicopathological Insights From Vessel Wall Imaging of Unruptured Intracranial Aneurysms".

Hudson JS, Zanaty M, Hasan DM.

Stroke. 2018 Dec 7:STROKEAHA118023744. doi: 10.1161/STROKEAHA.118.023744. [Epub ahead of print] No abstract available.

PMID: 30580746

Magnetic Resonance Vessel Wall Imaging in Human Intracranial Aneurysms.

Hudson JS, Zanaty M, Nakagawa D, Kung DK, Jabbour P, Samaniego EA, Hasan D.

Stroke. 2018 Dec 7:STROKEAHA118023701. doi: 10.1161/STROKEAHA.118.023701. [Epub ahead of print] No abstract available.

PMID: 30580739

Letter to the Editor Regarding "Estimation and Recanalization of Chronic Occluded Internal Carotid Artery: Hybrid Operation by Carotid Endarterectomy and Endovascular Angioplasty".

Zanaty M, Samaniego EA, Hasan DM.

World Neurosurg. 2019 Jan;121:287. doi: 10.1016/j.wneu.2018.09.033. No abstract available.

PMID: 30557930

Plasma Soluble Human Elastin Fragments as an Intra-Aneurysmal Localized Biomarker for Ruptured Intracranial Aneurysm.

Nakagawa D, Zanaty M, Hudson J, Teferi N, Ishii D, Allan L, Jabbour P, Ortega-Gutierrez S, Samaniego EA, Hasan DM.

J Am Heart Assoc. 2018 Sep 4;7(17):e010051. doi: 10.1161/JAHA.118.010051.

PMID: 30371156

Hybrid Surgery for Internal Carotid Artery Revascularization.

Zanaty M, Samaniego EA, Teferi N, Kung DK, Nakagawa D, Hudson J, Ortega-Gutierrez S, Allan L, Jabbour P, Hasan DM.

World Neurosurg. 2019 Jan;121:137-144. doi: 10.1016/j.wneu.2018.09.230. Epub 2018 Oct 9.

PMID: 30312821

Resection of a Pediatric Intramedullary Spinal Cord Tumor: 2-Dimensional Operative Video.

Woodroffe RW, Zanaty M, Kirby P, Dlouhy BJ, Menezes AH.

Oper Neurosurg (Hagerstown). 2019 Apr 1;16(4):518. doi: 10.1093/ons/opy185.

PMID: 30085227

Same-Day Discharge After Treatment with the Pipeline Embolization Device Using Monitored Anesthesia Care.

Zanaty M, Daou B, Chalouhi N, Starke RM, Samaniego E, Derdeyn C, Jabbour P, Hasan D.

World Neurosurg. 2016 Dec;96:31-35. doi: 10.1016/j.wneu.2016.08.050. Epub 2016 Aug 23.


Scott Seaman, MD

Medical school: Pennsylvania State University College of Medicine

Undergraduate: Saint Francis University

Hometown: Sewickley, PA

“When choosing the neurosurgery residency program at Iowa, I was struck by the types of cases the chief residents described being able to do own their own and the team-based mentality the residents seemed to have. Having been in the program for several years now, I still am struck by the fantastic training with high clinical volume, hands-on operative experience, and extensive research opportunities. The residents have a great team-based mentality and camaraderie that make the challenges of neurosurgery enjoyable. My wife and I love living in Iowa and it is a wonderful place to raise our three young children. I would absolutely choose Iowa again.”

Clinical interests

Open and minimally invasive skull base approaches

Research interests

  • Radiographic and clinical variation in Chiari Malformation I
  • Neurocognition in Chiari Malformation I and cerebellar contribution to modulating cognitive tasks
  • Brainstem anatomy/histology
  • 7T MRI of brainstem/cerebellum
  • Clinical outcomes in endoscopic transsphenoidal surgery

Selected publications

Seaman SC, Dawson JD, Magnotta V, Menezes AH, Dlouhy BJ. Fourth ventricle enlargement in Chiari malformation type I. Word Neurosurg. 2019 Sept 9.

Seaman S, Kerezoudis P, Bydon M, Torner JC, Hitchon PW. Titanium vs. polyetherketone (PEEK) interbody fusion: Meta-analysis and review of the literature. Clin Neurosci. 2017. Oct;44:23-29.

Payne R, Seaman S, Sieg E, Langan S, Harbaugh K, Rizk E. Evaluating the evidence: is neurolysis or neurectomy a better treatment for meralgia paresthetica?  Acta Neurochir (Wien). 2017 May; 159 (5): 931-936.

Seaman S, elson P, Alexander J, Swift A, Fick J. Resolution of intractable retching following mobilization of a dolichoectatic vertebral artery: case report of a unique brainstem-cranial nerve compression syndrome. J Neurosurg. 2017 Oct; 127(4): 761-767.

Krishnamurthy V, Mukherjee D, Reider A, Seaman S, Singh G, Fernandez-Mendoza J, Saunders E. Subjective and objective sleep discrepancy in symptomatic bipolar disorder compared to healthy controls. J Affect Disord. 2018 Mar 15; 229:247-253.

Brian Park, MD

Medical school: University of Iowa Roy J. and Lucille A. Carver College of Medicine

Undergraduate: University of California, San Diego

Hometown: Anaheim, CA


Deep brain stimulation hardware-related infections: 10-year experience at a single institution.

Abode-Iyamah KO, Chiang HY, Woodroffe RW, Park B, Jareczek FJ, Nagahama Y, Winslow N, Herwaldt LA, Greenlee JDW.

Risk factors for surgical site infections and assessment of vancomycin powder as a preventive measure in patients undergoing first-time cranioplasty.

Abode-Iyamah KO, Chiang HY, Winslow N, Park B, Zanaty M, Dlouhy BJ, Flouty OE, Rasmussen ZD, Herwaldt LA, Greenlee JD.

Thoracic Meningocele and Cervical Syringomyelia Treated with Ventriculoperitoneal Shunt.

Close LN, Park B, Woodroffe RW, Hitchon PW.

Fibro-osseous lesion of the cranium in an adolescent patient.

Park B, Abode-Iyamah K, Lee SL, Kirby P, El-Khoury G, Wilson S.

Intraventricular foramen of Monro cavernous malformation.

Winslow N, Abode-Iyamah K, Flouty O, Park B, Kirby P, Howard M 3rd.

Value of Targeted Epidural Blood Patch and Management of Subdural Hematoma in Spontaneous Intracranial Hypotension: Case Report and Review of the Literature.

Rettenmaier LA, Park BJ, Holland MT, Hamade YJ, Garg S, Rastogi R, Reddy CG.

IgG4 related disease of the craniovertebral junction

Park B, Starks R, Kirby P, Menezes A, Dlouhy B


Mark Dougherty, MD

Medical school: University of Chicago Pritzker School of Medicine

Undergraduate: Duke University

Hometown: Austin, TX

“‘At Iowa, you WILL learn to operate, whether you like it or not’ – this was said to me on my interview day, and was a big selling point. Strong research mentorship. Challenging but non-malignant environment, with good resident autonomy, in a place that’s easy to live.”

Clinical and research interests

  • Skull base surgery
  • Benign/low grade tumors
  • Novel surgical techniques
  • Functional neurosurgery

Selected publications



Article: Predictors of Reduced Opioid Use with Spinal Cord Stimulation in Patients with Chronic Opioid Use
Journal: Neuromodulation: Technology at the Neural Interface

Nahom Teferi, MD

Medical school: Addis Ababa University College of Health Sciences

Post-Doctoral scholar/fellowship in neurosurgery: University of Iowa Hospitals and Clinics

Hometown: Addis Ababa, Ethiopia

“Having had the chance to pursue a post-doctoral fellowship in the Department of Neurosurgery at the University of Iowa, I was able to witness firsthand the cutting-edge scientific research and world class patient care that is rendered to our patients on a day to day basis. The diverse array of clinical presentations as well as volume of operative cases was also unparalleled. In addition, the utmost emphasis in training future academic neurosurgeons, who are leaders in their respective subspecialties along with the camaraderie and friendship among the residents, made choosing Iowa neurosurgery training program an easy choice.”

Clinical and research interests

I have keen interest in pursuing novel treatment approaches and research in the field of neuro-oncology, particularly in immunotherapy and the role of nanotechnology in the design and delivery of cell-specific anticancer molecule and their effect in GBM tumor kinetics.


Zanaty, M., Samaniego, E.A., Teferi, N., Kung, D.K., Nakagawa, D., Hudson, J., Ortega-Gutierrez, S., Allan, L., Jabbour, P. and Hasan, D.M., 2019. Hybrid surgery for internal carotid artery revascularization. World neurosurgery, 121, pp.137-144.

Holland, M.T., Teferi, N., Noeller, J., Swenson, A., Smith, M., Buatti, J. and Hitchon, P.W., 2017. Stereotactic radio surgery and radio frequency rhizotomy for trigeminal neuralgia in multiple sclerosis: A single institution experience. Clinical neurology and neurosurgery, 162, pp.80-84.

Teferi, N.T., Hadera, F.A. and Gudeta, M., 2017. Knowledge, Attitude, and Practice of Health Extension Workers in Prescribing Antimalarials in Assosa Zone of Benishangul Gumuz Regional State (BGRS), Northwestern Ethiopia, Ethiopian Medical Journal, 55(3).

M.S., Zanaty, M., Teferi, N., Kung, D., Limaye, K., Al Kasab, S., Nakagawa, D., Jabbour, P., Samaniego, E.A. and Hasan, D.M., 2019. Abstract TP561: The Effects of Recanalization of Chronically Occluded Internal Carotid Artery on Patients' Neurocognition. Stroke, 50(Suppl_1), pp.ATP561-ATP561.

Nakagawa, D., Zanaty, M., Hudson, J., Teferi, N., Ishii, D., Allan, L., Jabbour, P., Ortega‐Gutierrez, S., Samaniego, E.A. and Hasan, D.M., 2018. Plasma Soluble Human Elastin Fragments as an Intra‐Aneurysmal Localized Biomarker for Ruptured Intracranial Aneurysm. Journal of the American Heart Association, 7(17), p.e010051.

Zanaty, M., Roa, J.A., Piscopo, A.J., Kritikos, M.E., Teferi, N. and Howard III, M.A., 2019. Methods and Devices for Posterior Ventriculoperitoneal Shunt Placement Surgery: 25 Years of Iterative Refinement. World neurosurgery.

Chieng, L., Madhavan, K., Teferi, N., Wang, M. and Vanni, S., 2018. 329 Prolonged Use of Narcotic Following Lumbar Spine Surgery: Predictive Factors and Outcome Analysis. Neurosurgery, 65(CN_suppl_1).


Hitchon P., Teferi, N., Abukhiran, I., Noeller, J., Helland, L., Bathla, G., Nourski, K., 2019. Vertebral Hemangiomas: diagnosis and management. A single center experience. World Neurosurgery- Submitted

Timothy Woodiwiss, MD

Medical school: University of Washington School of Medicine

Undergraduate: Washington State University

Hometown: Moses Lake, WA

“During my sub-internships around the country, I was impressed with the uniform consensus around the excellent track record of producing well trained academic neurosurgeons at the University of Iowa.  During my interview at the University of Iowa, I was struck by the enthusiasm for and commitment to structured resident mentorship by Dr. Howard and Dr. Greenlee, as well as the two dedicated years for research which can take place anywhere in the world. After ranking Iowa highly and being fortunate enough to match here, I can say with confidence that if being an academic neurosurgeon is your career goal, then the University of Iowa should be a program on your radar.”

Clinical and research interests

  • Primary brain tumors

Selected publications

Ruzevick J, Woodiwiss T, Emerson S, Patel A, Sekhar L, Ferriera M. Adjuvant radiation does not decrease the risk of short-term tumor recurrence or improve overall survival in patients with atypical meningioma. Journal of Neuro-Oncology (2019). Submitted

Chibawanye E, Kreuser S, Zhang H, Arora S, Moyes K, Szulzewsky F, Wirsching H, Patel A, Kong P, Woodiwiss T, Houghton A, Pierce R, Crane C, Holland E. Anti-PD-L1 antibody direct activation of macrophages contributes to an abscopal response in murine brain tumors. Cancer Cell (2019). Submitted

Woodiwiss TR, Whipple M, Wu PC. Student satisfaction and the value of participation in a structured medical student research program. J Investig Med (2017) 65 (1): 111

Puthiyaveetil S, Woodiwiss T, Knoerdel R, Zia A, Wood M, Hoehner R, Kirchhoff H. Significance of The Photosystem II Core Phosphatase PBCP For Plant Viability and Protein Repair in Thylakoid Membranes. Plant Cell Physiol (2014) 55 (7): 1245-1254

Alumni Residents

Our residents have many choices available after completing their residency training.

Below is a summary of recent resident destinations.  

Alumni destinations

  • 2018, Olatilewa Awe, Mosaic Life Care
  • 2018, Yasunori Nagahama, UCLA Health
  • 2017, Kingsley Abode-Iyamah, Mayo Clinic
  • 2016, Taylor Abel, University of Pittsburgh Medical Center
  • 2016, Andrew Grossbach, The Ohio State University
  • 2015, Brian Dalm, The Ohio State University
  • 2015, Stephanus Viljoen, The Ohio State University
  • 2014, Raheel Ahmed, University of Wisconsin School of Medicine and Public Health
  • 2014, Daniel Hansen
  • 2013, Kelly Mahaney, Stanford University
  • 2013, Brian Dlouhy, University of Iowa
  • 2012, David Kung, University of Pennsylvania
  • 2012, Adam Jackson, Sanford Health
  • 2011, Nadar Dahdaleh, Northwestern Medicine
  • 2011, Timothy Vogel, Hackensack University Medical Center
  • 2011, Timothy Lindley, Heartland Orthopedic Specialists
  • 2010, Chandan Reddy, University of Florida Health
  • 2010, Fangxiang Chen, Mercy Health System
  • 2009, Gregory Albert, Arkansas Children's Hospital
  • 2009, Saul Wilson, University of Iowa
  • 2008, Albert Fenoy, McGovern Medical School at UT Health
  • 2008, Bryan Bertoglio, Amita Health Medical Group
  • 2007, Meryl Severson, Durham VA Health Care
  • 2006, David Hasan, University of Iowa
  • 2006, Steven Kraljic, CHI St. Alexius Health
  • 2005, Kurt M. Eichholz, St. Louis Minimally Invasive Spine Center
  • 2005, Dan Guillaume, University of Minnesota
  • 2004, Christopher Barry, Neurological Services
  • 2004, Jeremy Greenlee, University of Iowa
  • 2003, Laurie Ackerman, Indiana University

Post Doctoral Clinical Trainees

  • Jack McNulty, MD
  • Henry Ruiz Garcia, MD
  • Mani Sandhu, MBBS