Expert Witness

is a sociologist with training in criminology and psychiatric epidemiology. He serves as a court-appointed expert witness in state and federal cases. He is an Assistant Professor in the Department of Mental Health Law and Policy at the University of South Florida in the College of Behavioral and Community Sciences. He recently served as a National Institutes of Health, National Institute of Drug Abuse Postdoctoral Fellow in the Department of Epidemiology at the University of Florida. Dr. Johnson leads a research laboratory of 25 independent researchers that investigates the effects of childhood trauma and substance misuse on health and behavioral outcomes among youth in the criminal justice system. His scholarship focuses on opioid misuse, childhood trauma, social disadvantage, and ethnic and cultural studies. Dr. Johnson houses a comprehensive dataset that contains over 100,000 youth in the criminal justice system and has published over 20 studies on how childhood trauma and substance abuse impact youth. He is an experienced and effective expert witness, with more than 15 testimonies, 30 reports and depositions, and over 10,000 individuals trained in the effects of trauma, social disadvantage, and addiction on adolescent health and behavior.

Expert Witness Services by the Numbers

Building bridges between science and the justice system




Reports and Depositions


Individuals Trained

has been awarded the McKnight Doctoral Fellowship, the Lydia Donaldson Tutt-Jones Research Grant, the UF Rollo Award, membership in the Alpha Lambda Epsilon Honors Society, and membership in the Bouchet Honors Society as well as other prestigious awards and honors for his excellence in research and dedication to community service. His passion is to strengthen the justice system through leveraging scientific literature, empirical research, and partnerships between systems of care.

Johnson Forensic Services was founded in 2016 by Dr. Micah E. Johnson when he was first asked to testify as an expert witness in the area of childhood trauma in a capital case.  As a scholar with lived experience, Dr. Johnson draws from his research in the fields of sociology, criminology, and epidemiology to serve the justice community. Since then, he has dedicated himself to bridging the gap between the scientific community and the justice community.

and his team have conducted literature reviews and case analyses, produced expert witness reports, and testified in several criminal court cases over the years. In many instances, his testimony was regarded as a pivotal moment in the case, and his delivery has been described as “credible and captivating”.  His previous clients have included state, federal, and private entities.

Dr. Micah E. Johnson’s CV

Best Report

Best report that I have ever read.

~ Investigator, Tampa

Powerful Testimony

It was so powerful and moving. Even the Bailiff said that was extraordinary.

~ Investigator, North Florida

A perfect blend of science and experience

Dr. J is a hardcore researcher who relies on science but also acknowledges the importance of professional and life experiences. He delivers a perfect blend of science and experience with a genuine intent to serve the justice system.

~ Pre-Law Intern

Contact Dr. Johnson today to get help with your next case.