Dr. Richardson graduated from Yale University, Department of Psychiatry in 2001 and began treating veterans with post-traumatic stress disorder and co-occurring illnesses such as substance use disorders, anxiety disorders, mood disorders and psychotic disorders. He has been in private practice since 2003 and treats a variety of illnesses, the majority of which have co-occurring substance use disorders. He is a national trainer for Cognitive Processing Therapy, a cognitive behavioral therapy for PTSD. He is a diplomat of the American Board of Psychiatry and Neurology and an Assistant Clinical Professor of Psychiatry at Yale University where he teaches Yale residents general psychiatry. He graduated from Baylor University with a BA in Philosophy and a minor in Physics and earned his MD from the University of Tennessee.