Career
He played as a pitcher in Major League Baseball (MLB) and Nippon Professional Baseball. He is the bullpen coach for the Milwaukee Brewers of MLB. Tunnell pitched all or part of six seasons in the majors, between 1982 and 1989, for the Pittsburgh Pirates, Saint Louis Cardinals, and Minnesota Twins. He also pitched three seasons in Nippon Professional Baseball, from 1991 until 1993, for the Fukuoka Daiei Hawks.
Following his playing career, Tunnell coached in the minor leagues for several years, including a brief stint as interim pitching coach with the Cincinnati Reds in 2006.
In July 2012, he was named interim bullpen coach of the Milwaukee Brewers, a position he has held since then