Beaubien was appointed to the House in October of 1996 to fill a vacancy for Wauconda Republican Al Salvi, who left office as he was waging a campaign for U.S. Senate.
He was elected in his own right just weeks later, and subsequently re-elected to six additional two-year terms.
As a state representative for the past 15 years, some of Mark Beaubien's proudest moments included spearheading seat belt enforcement initiatives, supporting civil unions legislation, and municipal pension reform, his family noted in a statement.
Before his time as a lawmaker, Beaubien, who worked as both an attorney and banker, served the suburbs as a member of the Lake County Board and as Cuba Township Supervisor.
He also was an active member of a number of suburban civic organizations, including Northwestern University Committee on Athletics and Recreation, the board of directors of Buehler YMCA in Palatine, the board of directors at Northwest Community Hospital, a Member of the John Evans Club of Northwestern University, the Barrington Area Community Center Task Force, the Barrington Area Seniors Task Force and the Founders' Committee of the Ela Area YMCA.
In a statement, his family described him as "a confident man who refused to limit his ideals to those of his generation, embracing the timeless values of honor, respect, loyalty and integrity while rejecting its occasional intolerance and prejudice."
His legacy, they noted, is in his convictions and values.