Mark Dion

Mark N. Dion (born 1955) is an American politician, law enforcement officer and lawyer from Maine, currently serving on the Portland City Council. Dion, a Democrat, was elected Sheriff of Cumberland County, Maine in 1998. Dion was criticized during his 2002 campaign for using a county credit card and attending law school. After being re-elected in 2002 and 2006, Dion chose not to seek re-election as Sheriff in 2010. Instead, he successfully sought a seat in the Maine House of Representatives. In 2013, Dion was named Chair of the Criminal Justice and Public Safety Committee. In March 2015, while a member of the House, Dion announced that he would sponsor legislation to make marijuana legal. Dion ran for Governor of Maine in 2018, placing fifth in the Democratic Party primary. In 2020, he won a seat on the Portland City Council after a four-way race where he won 39% of the vote. In June 2023, Dion announced his intention to run for mayor of Portland. Education Dion earned a B.A. in criminal justice at the University of Southern Maine, a M.A. in human services administration from Antioch University New England and a J.D. from the University of Maine School of Law.