Bachelor, Catholic University of America, Washington, 1985. Juris Doctor, University Maryland School Law, Baltimore, 1988. Doctor (honorary), Strayer University.
Legislation fellow to United States senator Barbara Mikulski, 1987—1988. Assistant state's attorney City of Baltimore, 1988-1990. Member from 3rd District Baltimore City Council, 1991—1999.
Mayor City of Baltimore, 1999—2007. Governor State of Maryland, Annapolis, since 2007. Co-chairman task force on federal-local law enforcement United States Conference Mayors.
Member of Maryland Bar Association, Friendly Sons St. Patricks.
Son of Tom and Barbara O'Malley, Tom and Barbara O'Malley. Married Catherine Curran, 1990. Children: Grace, Tara, William, Jack.