Over his many years of public service, Krystjan has worked with both leaders in state government and private business to successfully negotiate over $100 billion in bi-partisan state budgets, deliver once-in-a-lifetime changes to Pennsylvania's tax code, significantly enhance funding and educational opportunities for children, expand healthcare access and coverage for all Pennsylvanians and help foster some of the largest economic investments in the history of the Commonwealth.

Callahan was previously a partner at a Harrisburg based government affairs firm. At the beginning of his career he served as the Executive Director to the House Republican Whip and as the Executive Director of the House Republican Policy Committee. Callahan has also worked on the Commerce Committee in the House Republican Research Department and staffed several caucus task forces.

Callahan currently serves on various boards including serving on the Counsel of Trustees at his alma mater Lock Haven University, now Commonwealth University of Pennsylvania.

A native of Wellsboro, Callahan and his family currently reside in Mechanicsburg, PA.