Stuart Snyder has stepped down as prexy-COO of Turner Broadcasting’s animation and kidvid unit.

The move comes amid the other changes at the top of Turner ever since John Martin took the reins as chairman-CEO of the parent org in January.

Snyder had been a top exec at Cartoon Network and Turner Animation since 2005. His departure follows on the heels of the promotion of David Levy, Turner’s longtime ad sales, distribution and sports chief, to the post of TBS prexy under Martin.

In a memo to his staff, Snyder said he had “mixed emotions” about leaving Turner but did not give any indication of his next move.

“One of my goals has always been to leave an organization in better shape than when I joined.  I believe together we have accomplished this goal,” Snyder wrote.

Levy in a separate memo credited Snyder with helping to “lay the foundation for the success that Turner enjoys today.”

There was no immediate word on whether TBS will replace Snyder in his role overseeing Cartoon Network, Boomerang and Adult Swim.

News of Snyder’s departure was first reported by the Los Angeles Times.