Mark O’Brien is the Director of Opioid Overdose Prevention and Treatment for the Baltimore City Health Department. In this capacity, he is responsible for implementing the Baltimore City Opioid Overdose Prevention and Response Plan and opioid treatment expansion efforts. Prior to starting at BCHD, Mark was a Senior Criminal Justice Policy Associate and Acting Director of Communications in Legal Action Center’s Washington, D.C. office where he advocated reducing social and legal barriers for people with criminal records and addictions, and expanding access to substance use disorder treatment. He has provided reentry and employment support services to people coming home to Baltimore from prison. He is a graduate of Towson University and Georgetown University Law Center.