MLB Trivia: That Would Be Grand

Nine players in MLB history have hit two grand slams in one game. Among those players: Nomar Garciaparra is the only player to have hit his from each side of the plate, Jim Northup hit his on consecutive pitches received, and Fernando Tatis hit his in the same inning. But what about grand slam droughts? Can you name the player who hit the most home runs before hitting his first grand slam?