Career
He played for four Major League teams from 1990–1993, 1995–1996, and 1999. Decker began his coaching career as a hitting coach for the Salem-Keizer Volcanoes in 2001-2002 and the Fresno Grizzlies in 2003-2004. He then managed for Salem-Keizer (2005-2007), the San Jose Giants (2008), the Connecticut Defenders (2009), and the Fresno Grizzlies (2010-2011).
In 2012, he swapped positions with Bob Mariano, who replaced him as the Grizzlies" manager, and became coordinator of minor-league hitting instruction for the Giants.
In 2015, he took his first major league coaching position as assistant hitting coach for the San Francisco Giants. Decker is married with two daughters and resides in Keizer, Oregon.