After graduation from the University of Cincinnati, Maag went on to work for Bristol-Myers Squibb Company.
With incumbent Michelle Schneider unable to run due to term limits, Maag was one of three who sought to replace her.
In his first reelection bid, Maag again faced primary opposition from fellow Republican Ginger Kubala, however was victorious by over 5,000 votes.
He also serves on the Warren County Transportation Improvement District Board of Trustees.
In 2012, Maag won a third term, now representing the 62nd district, with 71.05% of the vote over Democrat Mike Kassalen.