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Forensic Team:

R. Gregg Dwyer, M.D., EdD

Dr. Gregg Dwyer received a Bachelor of Science in Sociology from the University of the State of New York, Master of Arts in Management from Webster University, Doctor of Education from Virginia Tech, and Doctor of Medicine from the University of Arkansas for Medical Sciences. After serving in the U.S. Navy, he was commissioned a civilian special agent with the United States Naval Criminal Investigative Service (NCIS), serving in field, headquarters, operational, and staff positions. His experience includes criminal investigations, special operations, foreign counterintelligence, special protection & antiterrorism, training, research & development, and critical incident peer counseling. He has held academic appointments in criminal justice programs at Montgomery College in Maryland, Northern Virginia Community College and the University of Arkansas at Little Rock and has been on the faculty of the U.S. Department of Justice (USDOJ) National Advocacy Center and National College of District Attorneys.

He is an Associate Professor in the Medical University of South Carolina (MUSC) Department of Psychiatry and Behavioral Sciences, where he is Director of Forensic Psychiatry and Director of the Sexual Behaviors Clinic and Lab.  Dr. Dwyer is board certified in General, Child & Adolescent, and Forensic Psychiatry and is an American Association of Sexuality Educators, Counselors and Therapists certified Sex Therapist and a Clinical Sexologist Diplomate of the American Board of Sexology.  He has provided general and case specific consultation including sexual behavior evaluations to various state government agencies including attorney generals and state police, probation, public defender, mental health, and juvenile justice departments, private attorneys, and individual public and private mental health clinicians.

As a consultant to a federal agency, Dr. Dwyer assisted in the formation of their peer support team, designed, developed and conducted their first peer team training course, participated in screening and selecting their peer members, and has provided instruction on stress management and mental health to their personnel throughout the U.S. He consults with federal, state and local criminal justice system professionals working Internet crimes against children cases for mental health support and has provided to them instruction on preventing and managing stress related to the investigation and processing of child exploitation evidence. Dr. Dwyer has consulted on the development of a promotion process for a city police department and as a sworn criminal investigator was a charter member of a federal law enforcement agency peer support team for whom he also co-authored their original briefing and training video on peer support and critical incident stress management. For a state level law enforcement employees’ assistance program, he provides mental health support to sworn and support personnel for officer-involved shootings and other critical events. Dr. Dwyer participates in state sponsored post critical incident seminars for law enforcement personnel and post deployment seminars for National Guard and other military members. He also conducts fitness-for-duty evaluations for law enforcement and health care professionals including for licensing boards. 

Dr. Dwyer has received federal, state and private research grant funding, presented nationally and internationally, and published peer-reviewed articles and book chapters. His clinical, consulting, research, presentation, and teaching focus areas are human sexual behavior including paraphilias and problem and offending behaviors, law enforcement stress prevention and management, and impact on criminal justice personnel of working investigations of crimes against children. He is a peer reviewer and on the editorial boards of several journals. He has received fellowship awards from multiple national associations and serves on the committees of both national and international professional associations.


Susan C. Knight, Ph.D., ABPP

Assistant Professor, Forensic Psychiatry, is Board-Certified in Forensic Psychology with expertise in criminal forensic psychology. After receiving her doctorate in Clinical Psychology, she completed a Fellowship in Forensic Psychology at the USC-Keck School of Medicine (Institute of Psychiatry, Law and Behavioral Science) in Los Angeles, California. Specialty practice areas include assessment of legal competencies, criminal responsibility, diminished capacity, violence risk assessments, sentencing/dispositional assessments, sexual offender evaluations and psychological autopsies. She also conducts fitness for duty evaluations for a variety of professional populations. She has worked with forensic populations in the county, state, and federal prison systems, has experience in conducting pre-trial and post-trial psychological forensic evaluations, and in providing consultation for both federal and state court systems. She has been qualified as an expert witness in federal court and in South Carolina General Sessions Court. In addition to her clinical case work, she also provides supervision, training and teaching of students, residents and fellows as well as having had an adjunct faculty position at the Charleston School of Law where she has taught a course on mental health law.


Leonard W. Mulbry, M.D.

Assistant Professor, Forensic Psychiatry, is Board-Certified in General and Forensic Psychiatry. He completed a residency in General Psychiatry and a Fellowship in Forensic Psychiatry at the Medical University of South Carolina (MUSC). His interest and specialty is evaluation of criminal competency, including competency to stand trial, criminal responsibility and capacity to conform, as well as mitigation, and violence risk assessment. He works in the Sexual Behaviors Laboratory and Clinic (SBLC) at MUSC for the assessment of sexual offenders. He also has extensive experience doing evaluations for Guardianship and Conservatorship for Probate Court. He has been certified as an expert in Federal, US Military, South Carolina General Sessions and Probate Court. He has experience treating patients within the South Carolina Department of Corrections and the local Mental Health Centers. He is an active participant in the teaching program at MUSC providing supervision and lectures for medical students, residents and fellows. He is an adjunct faculty member and co-lecturer for the ‘Psychiatry and the Law’ course taught at the Charleston School of Law. He has in the past had a long career in Orthopedic, Hand and Microsurgery. 


Diana M. Mullis, M.D.

Assistant Professor with the Department of Psychiatry and Behavioral Sciences at the Medical University of South Carolina (MUSC). Dr. Mullis is Board-certified in Psychiatry, a Diplomat of the American Board of Psychiatry and Neurology, and fellowship trained in Forensic Psychiatry. Dr. Mullis completed her residency training in Psychiatry and Fellowship in Forensic Psychiatry at MUSC. Prior to her psychiatric training and subsequent practice in the field of Psychiatry, she practiced several years as a board-certified physician in the field of Emergency Medicine. Dr. Mullis maintains a clinical practice and actively participates as a faculty member to train and supervise medical students, residents, and fellows. She has a special expertise and interest doing evaluations of Traumatic Brain Injury to assess for cognitive deficits and neurobehavioral changes. She has extensive experience in this area, including designation as a specialist examiner for Traumatic Brain Injuries with the Veteran’s Administration. Dr. Mullis is experienced in performing criminal and civil evaluations for the defense and plaintiff, including legal competency to stand trial, criminal responsibility, and diminished capacity. She also has experience in performing evaluations for mitigation, violence risk assessments, fitness for duty, Independent Medical Evaluations, standard of care and malpractice case analysis, emotional harm and disability, and correctional medical care. She is qualified as a consulting and testifying expert, and has been qualified as an expert in Probate Court, Court of Common Pleas, Court of General Sessions, and in federal court cases.


Christopher S. Fields, M.D.

Fellowship Director for the Forensic Psychiatry Fellowship at MUSC and Assistant Professor, is Board Certified in Psychiatry, Child & Adolescent Psychiatry and Forensic Psychiatry. Dr. Fields completed Fellowships in Forensic Psychiatry and Child & Adolescent Psychiatry at Emory University School of Medicine in Atlanta. Dr. Fields has experience with adult populations on forensic issues including: competency to stand trial, criminal responsibility, mitigation, disability and Independent Medical Examinations. Due to his training and expertise with children he also specializes in child and family issues including: custody, visitation, parental fitness, termination of parental rights, abuse/neglect, juvenile competency to stand trial, juvenile waivers to adult court, and treatment of juvenile offenders. Prior to his current work at MUSC, Dr. Fields served as medical director for a large residential psychiatric treatment facility for children in Atlanta, GA. In addition to his forensic work, Dr. Fields has clinical roles at MUSC running an acute adult psychiatric unit and providing outpatient treatment for children and adolescents.  Given his clinical and administrative experience, Dr. Fields also has interests in psychiatric malpractice and suicide.


Rabiya Hasan, M.D.

Assistant Professor with the Department of Psychiatry and Behavioral Sciences at the Medical University of South Carolina (MUSC). Dr. Hasan is Board-certified in Psychiatry, Board-certified in Child and Adolescent Psychiatry, a Diplomat with the American Board of Psychiatry and Neurology and fellowship trained in Forensic Psychiatry. Dr. Hasan completed her residency training in Psychiatry and fellowships in Child and Adolescent Psychiatry and Forensic Psychiatry at MUSC. Dr. Hasan is one of the attending psychiatrists on the youth inpatient psychiatric unit and works at the STAR programs, which are class intensive, comprehensive outpatient treatment programs for children and adolescents with severe behavioral and emotional disturbances. She also provides psychiatric consult services for pediatric inpatients at the MUSC Children’s Hospital. She actively participates as a faculty member to train and supervise medical students, residents, and fellows. Dr. Hasan is experienced in performing criminal and civil evaluations for the defense and plaintiff, including Competency to Stand Trial and Criminal Responsibility and Capacity to Conform. She also has experience in performing evaluations for Mitigation, Violence Risk Assessments, Emotional Harm and Disability, and Conservator and Guardianship. She has extensive experience in working with patients in adult penitentiaries and in the juvenile justice system. She is qualified as a consulting and testifying expert, and has been qualified as an expert in Probate Court and Court of General Sessions.

Joseph Secondary, RPSGT, RST

Graduated from Laboure College in Boston, MA with a Degree in Clinical Neurophysiology. He trained in EEG, SLEEP, EP, EMG, IOM and LTM epilepsy diagnostic studies. He has worked in clinical and research sleep and neurophysiology since 1993. Registered Polysomnographic Technologist and has managed sleep centers for over 10 years. Specialized in sleep lab development. Experience in community and corporate education for sleep disorders and sleep wellness. He is also certified to administer penile plethysmography (PPG) for the SBCL.  He has worked at MUSC since June 2010.

Social Workers

Betsey Hodges, LISW-CP

Mary Lou Shoemaker, MSW

Mollie W. Dadin, LISW

Administrative Coordinator

Alison Knight, MBA

Forensic Psychiatry Program
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