As player

• Detroit Tigers (1989)

As coach

• Cleveland Indians (2002-2009)
• Baltimore Orioles (2010)
• Seattle Mariners (2011-2013)

Jeffrey William Datz (born November 28, 1959) is an American professional baseball scout and a former Major League Baseball player and coach for the Seattle Mariners. In 2015-16, he was listed as a professional scout for the New York Yankees.

A former catcher, Datz played in seven games for the Detroit Tigers in 1989. He was a coach with the Cleveland Indians from 2002 until the end of the 2009 season, when general manager Mark Shapiro fired the entire coaching staff.

He was manager of the minor league Buffalo Bisons in 1998 and 1999. Datz led the Bisons to the league championship crown in 1998.

At the 2008 Home Run Derby at Yankee Stadium, Datz pitched for Cleveland Indians center fielder Grady Sizemore.

Datz served as the bench coach for the Baltimore Orioles in 2010.

On November 4, 2010, Datz was hired to be third base coach for the Seattle Mariners starting with the 2011 season.

Before a Mariners game against the Los Angeles Angels of Anaheim on April 27, 2013, Datz announced that he was diagnosed with an undisclosed form of cancer, and Tacoma Rainiers manager Daren Brown was promoted to substitute for Datz. On July 25, 2013, Datz was named Mariners interim bench coach after Eric Wedge suffered a minor stroke. On August 23, 2013, Datz resumed his position on the team as an extra coach. On November 25, 2013, it was announced that Datz will serve the Mariners as a member of the club's professional scouting staff for the 2014 season.

He then joined the New York Yankees, where he was listed as a professional scout for the 2016 season.

[ Source: Wikipedia ]