A co-worker gave me this ball. He couldn't identify the signature but said his son won the ball maybe 15 years ago. His son didn't remember who it was either.
That’s a tough one. It doesn’t look like Tony Clark’s signature...
The autograph was obviously obtained after 2000 (when Selig unifies the baseballs from separate NL and AL balls).
i went though all of the players who wore #44 for several years from 2000 on; I wasn’t able to come up with anyone whose signature resembled what you have there.
Here’s a good resource if you want to start searching: