The Chesapeake Bayhawks selected Runkel from the MLL player pool in June of 2014.
Runkel attended Loyola University of Maryland, where he was a member of the 2012 NCAA Division I Men's Championship Lacrosse team. He holds the record for least goals allowed in a National Championship game. Jack graduated in May of 2013 with a Bachelors of Business Administration in General Business from The Sellinger School of Business and Management.
Runkel attended Avon Old Farms School in Avon, CT, where he was a four-year member of the honor roll and varsity lacrosse team.
Runkel was born to Richard and Kaelyn Runkel in Amherst, MA. He has a younger brother, Sam.