Glenn Sherlock has been with the Arizona Diamondbacks, since before there were actual Arizona Diamondbacks. He joined the team as a minor-league instructor, all the way back in 1996. That wasn't his first gig as a coach either, having been a manager in the Yankees' farm system - he was Mariano Rivera's first professional manager, as part of the 1990 Rookie Gulf Coast League Yankees. Sherlock spent one winter in charge of the Canberra Bushrangers in the Australian Baseball League, and also coached future Diamondbacks' manager Bob Melvin when he was with the Yankees.
Sherlock's first duties here were as a catching coordinator, and he also helped scout the Expansion Draft which helped fill out Arizona's roster in November 1997.