Corrigan first articled to and then practised as associate counsel with James Lorimer until May 1978. He was a partner in Corrigan, Bernardino, Dorman and Baker from 1978 until 1990.
Corrigan began his career by interning with and subsequently working as an associate lawyer under James Lorimer until May 1978. He became a partner at Corrigan, Bernardino, Dorman and Baker in 1978 and remained so until 1990.