Dennis M. Mannion is currently CEO & President of House of 7, LLC, a sports advisory company with professional and amateur sports clients. Mannion was CEO and President of Palace Sports and Entertainment where he oversaw Business Operations of the Detroit Pistons, The Palace of Auburn Hills, DTE Energy Music Theatre, Meadow Brook Amphitheatre, and Freedom Hill Amphitheatre. He has worked in all four Major League sports: MLB, NHL, NBA, and NFL.