Sullivan played for the Rockies from 2005-08, the Mets in '09 and the Astros in 2010. He spent 36 games in the Minors with the Phillies in '11 before retiring, and he has continued to live in the Denver area.
"I've always loved the game and wanted to be a part of it one way or another," said Sullivan, who also has been involved in working with youth players with Mike Bard, who spent a season as a Rockies assistant to the hitting coach and runs a baseball facility. "There was a period where I thought I was going to go into the front office, but some things kept me at home. Then this opportunity came up, I tried to take advantage of it, went and auditioned."
• Rockies outfielder Carlos Gonzalez has been working at the Rockies' complex for several days but took Monday off to shoot video and still shots for a sporting goods ad campaign. He'll represent Nike in a commercial with fellow Major Leaguers Jacoby Ellsbury and Mike Trout and NFL quarterback Colin Kaepernick.
Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.