Glenn Patrick Sherlock (born September 26, 1960) American professional baseball coach. He is currently a coach for the New York Mets. He previously was a coach for the Pittsburgh Pirates, and one of the original coaches for the Arizona Diamondbacks, serving for 19 consecutive seasons (1998–2016). He was the team's longtime bullpen coach, although he spent stints as bench coach (2003), first base coach (2004) and third base coach (2004; 2014).