Joseph C. Hsieh, M.D.
November 1, 2022

Joseph C. Hsieh, MD

Dr. Joseph Hsieh is a graduate of Stanford University with a masters in biology. He holds both an MBA and an MPH from The Anderson School of Management and the School of Public Health at the University of California, Los…


Ryan S. Kitagawa, M.D.
November 1, 2022

Ryan S. Kitagawa, MD

Dr. Ryan Kitagawa is an assistant professor at McGovern Medical School at UTHealth with a primary clinical and research focus in the care of adult patients with Traumatic Brain Injury (TBI). He strives to provide top quality care to all…


Karl M. Schmitt, M.D.
November 1, 2022

Karl M. Schmitt, MD

Karl Schmitt, MD, is an assistant professor of neurosurgery at McGovern Medical School at UTHealth and is board certified by the American Association of Neurological Surgery. Dr. Schmitt is a graduate of The University of Texas Medical Branch at Galveston;…


Nitin Tandon, MD
November 1, 2022

Nitin Tandon, MD

Visit the Tandon Research Laboratory Dr. Nitin Tandon is a professor and board-certified neurosurgeon with the Vivian L. Smith Department of Neurosurgery at UTHealth Medical School. Dr. Tandon also serves UTHealth Houston as the Vice President of Strategy and Development…


Stephen A. Fletcher, DO
November 1, 2022

Stephen Fletcher, DO

Stephen A. Fletcher, DO, received his medical degree at the University of North Texas Health Science Center’s Texas College of Osteopathic Medicine, and completed his neurosurgery residency at The University of Texas Health Science Center at Houston/Memorial Hermann-Texas Medical Center…


Dr. HuiMahn Alex Choi
November 1, 2022

Huimahn A. Choi, MD, MS

Board Certifications Diplomate, American Board of Psychiatry and Neurology


Jay-Jiguang Zhu, M.D., Ph.D.
November 1, 2022

Jay-Jiguang Zhu, MD, PhD

Board Certifications American Board of Psychiatry and Neurology Dr. Jay-Jiguang Zhu earned his medical degree from McGill University in Montreal, Quebec, Canada. He completed his residency training in neurology at Tufts University School of Medicine in Boston, Mass. He subsequently…


John P. Hagan, Ph.D.
November 1, 2022

John P. Hagan, PhD

Dr. Hagan received his Ph.D. from the University of Pittsburgh under the mentorship of the HHMI Investigator Dr. Paula Grabowski where his research focused on elucidating the molecular mechanisms responsible for exon definition during pre-mRNA alternative splicing. His initial postdoctoral…


Georgene W. Hergenroeder, RN, MHA, CCRC
November 1, 2022

Georgene W. Hergenroeder, PhD

Visit my research page


Sigmund Hsu, M.D.
November 1, 2022

Sigmund Hsu, MD

Sigmund Hsu, MD, is fellowship trained and certified by the American Board of Psychiatry and Neurology, with extensive experience in the evaluation and treatment of neurological disorders in cancer patients. He specializes in primary brain tumors as well as brain…


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