Grogan served on the Council from 1978 to 1981. He was part of a successful civil rights lawsuit filed in the 1970s against Marietta, charging that its ward map diluted the city’s black vote. The suit resulted in Marietta creating a majority-minority ward, City Councilman Reggie Copeland previously said.
In 1976 and 1978, Grogan served as president of the Marietta chapter of the NAACP, which later became the Cobb County NAACP. Grogan died in July 2009 at the age of 72.