Mike Halligan was raised in Billings, Montana. He enlisted in the U.S. Army and served in Vietnam as an infantry combat platoon leader with the 101st Airborne Division.
In 1975, Mr. Halligan completed a Bachelor of Arts Degree in History and Political Science at the University of Montana. He received a Master’s Degree in Public Administration in 1977, and graduated from the University of Montana School of Law in 1984.
Mr. Halligan served in the Montana State Senate from 1980 to 2002 as the chairman of several legislative standing and interim committees. In the 1995 and 1997 legislative sessions, he served as the Minority Leader.
After working as a deputy Missoula County Attorney from 1985 to 1990, Mr. Halligan operated a private family law practice from 1990 to 1999. He also served as the supervising attorney for the Montana Department of Justice, Child Protection Unit, from 1999 to 2002. He served as Director of Government and Corporate Relations for Washington Corporations from 2002 to 2021 and has been Executive Director of the Dennis and Phyllis Washington Foundation since November of 2002.