 Castor became Acting Attorney General less than a month later.After serving stints beginning in 1981 with, respectively, the Philadelphia District Attorney's Office, the Northampton County (PA) District Attorney's Office, as an LBJ Congressional Scholar (Washington, DC) and defending Federal prisoners at FCI-Alderson (WV), Castor began his professional career as an assistant district attorney in 1985 before becoming district attorney of Montgomery County from 2000 to 2008.He next took a seat on the Montgomery County Board of Commissioners, an elected position he held until January 4, 2016, when he was succeeded by Joe Gale.