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Forensic Experts


Reisfield-Gary2014-smGary Reisfield, M.D.

Chief of Forensic Psychiatry and Assistant Professor

After receiving his medical degree from the George Washington University School of Medicine, Dr. Reisfield completed an anesthesiology residency at the University of Florida and a pain medicine fellowship at the Massachusetts General Hospital/Harvard University.  Dr. Reisfield subsequently served as a hospice medical director and a pain and palliative medicine division chief at the University of Florida in Jacksonville.  As a part of his transition to the University of Florida in Gainesville, Dr. Reisfield completed an addiction medicine fellowship in the department of psychiatry.  Dr. Reisfield is board certified in anesthesiology and pain medicine and is board eligible in addiction medicine and palliative medicine.  He is a clinician-researcher and has authored more than fifty articles and book chapters. He currently serves as a forensic expert in the UF Forensic Institute.

Dr. Reisfield’s forensic expertise includes pain management, substance use disorders, diminished capacity due to intoxication and other impairment issues.



Martha E. Brown, M.D.

Associate Professor

Dr. Martha Brown attended medical school, and completed her residency and fellowship at the Medical University of South Carolina. After graduation, Dr. Brown moved to New Orleans where she was an Assistant Professor at the LSU Medical School and became Louisiana State Physician Health Program Director. After leading this program for impaired health professionals, developing prevention and treatment for patients from physicians to professional athletes, she was recruited to the University of South Florida (USF) Medical School. At USF she became an Associate Professor of Psychiatry and Director of the Division of Addiction Psychiatry. In 2006, in addition to this position, she became Associate Dean for Faculty Development in the USF College of Medicine.

Dr. Brown also has a long history of being asked to be an expert by State and Federal governmental agencies. She has a number of scholarly and research interests in addiction psychiatry.



Cooke-Brian2013Brian Cooke, M.D.

Assistant Professor

After completing his medical training at St. Louis University School of Medicine, Dr. Cooke trained as a psychiatrist at University of Maryland/Sheppard Pratt where he was chief resident. After completion of his residency Dr. Cooke completed a forensic fellowship at Yale University.  Currently, Dr. Cooke is an attending physician at the Shands at Vista hospital as well as an active medical school and residency instructor and supervisor. Dr. Cooke has provided forensic expertise in sanity, competency, violence and risk, recidivism and mitigation.



Mathew Nguyen, M.D.

Assistant Professor

Dr. Nguyen is a medical graduate of the University of Texas and completed his internship at Baylor University.  He then completed a psychiatric residency at Georgetown University and a child fellowship at the University of Florida. Currently Dr. Nguyen serves the UF Department of Psychiatry as the Associate Chief and Medical Director of the-Division of Child and Adolescent Psychiatry. In this capacity he provides care and oversight to other medical providers in both inpatient and outpatient settings. . In addition, Dr. Nguyen serves as Child Psychiatry’s Director of Medical Student Education.

Dr. Nguyen provides forensic evaluations and assessment in all areas related to Child Psychiatry including custody, trauma, and criminal offenses.




Natalie Colapelle-Snodgrass, MD Adjunct Assistant Professor

Natalie Snodgrass, MD

Adjunct Assistant Professor

Natalie Snodgrass, MD is a board certified forensic psychiatrist who trained in adult, child and forensic psychiatry at the University of Florida. In addition to these qualifications she is also certified to perform on examining committees to determine an individual’s capacity to care for their needs and to participate in decisions in which they are affected.