Tom O'Halleran is an American politician and former law enforcement officer. He served as a member of the U.S. House of Representatives from Arizona's 1st congressional district from 2017 to 2021. O'Halleran is a member of the Democratic Party and has focused on issues such as healthcare, education, and public safety during his time in office. Before entering politics, O'Halleran worked as a police officer and later became a police chief. He has also been involved in various community service initiatives. O'Halleran's background in law enforcement has influenced his approach to legislation, particularly in areas related to public safety and community welfare.