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 initially gained experience by working with James Lorimer in an entry-level capacity until May 1978. He then became a partner at Corrigan, Bernardino, Dorman and Baker, holding that position until 1990.