Since 2010, Dr. Terrell has consulted and testified in criminal cases involving memory. Today he is a nationwide expert focusing on eyewitness identification cases, cases involving delayed outcries of sexual assault, and other cases in which a witness’ recollection of events is in question. As of May 2025, he has consulted in over 300 cases and testified in over 50, including death penalty murder cases and appeals overseen by the Innocence Project of Texas.

Dr. Terrell has been a Professor of Psychology at the University of Mary Hardin-Baylor in Belton, TX since 2008. He has a B.A. in Psychology, a M.A. in Neuroscience, and a Ph.D. in Experimental Psychology, all from Baylor University in Waco, TX.

Dr. Terrell has given numerous CLE presentations, including ones to the State Bar of Texas Advanced Criminal Law Seminar, the Texas Criminal Defense Lawyers Association, the National Association of District Attorneys in Houston, the Center for American and International Law, and numerous national CLE companies online.