He has held the role of pitching coach for the Montreal Expos, Florida Marlins, Toronto Blue Jays, and Houston Astros, and is currently with the Arizona Diamondbacks.

[4] While pitching for the Rangers, he earned the save for Nolan Ryan's 300th career win against the Milwaukee Brewers in Milwaukee on July 31, 1990 (when the Brewers played in the American League).

[2] Arnsberg served as pitching coach for the Montreal Expos from 2000 to 2001 and the Florida Marlins in 2002 and 2003, when they won the World Series.

After a year in AAA in 2004 with the Syracuse SkyChiefs, he served as the Toronto Blue Jays pitching coach from 2005 to 2009.

Arnsberg currently resides in Cave Creek, Arizona, with his wife, Shelley.