Mark L. Plaumann has served as a director of Diamondback since October 2012 and is a Managing Member of Greyhawke Capital Advisors LLC, which he co-founded in 1998. He was formerly a Managing Director of Alvarez & Marsal and President of American Healthcare Management, and serves on the board of Mammoth Energy Services. He holds an M.B.A. and B.A. in Business Administration from the University of Central Florida.