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.

Question: How many seasons did he work with the Giants?
Self-contained rewrite: How many seasons did Jon Miller work with the Giants?