Allan Vestal, dean of the Drake University Law School, will resign due to health issues, the university announced today.

His resignation will be effective on June 30 and Vestal plans to return to a faculty position in fall 2015.

Benjamin Ullem has been appointed interim dean of the school, beginning July 1. Ullem is a senior partner at Whitfield & Eddy PLC in Des Moines, and served as chair of Drake’s board of trustees from 2000 to 2003.

 Drake will begin a national search for a new dean in August, the university said.