Conversation so far:
What did John Miller do with the Giants?
Since 1997 he has been employed as a play-by-play announcer for the San Francisco Giants.
When did Jon Miller start working with the Giants?
Since 1997 he has been employed as a play-by-play announcer for the San Francisco Giants.
How many seasons did Jon Miller work with the Giants?
Since 1997 he has been employed as a play-by-play announcer for the San Francisco Giants.
What is Jon Miller's contract with the Giants worth?

Question: Has he worked for other baseball teams?
Self-contained rewrite: Has Jon Miller worked for other baseball teams besides the Giants?