Conversation so far:
What happened in 1915?
Jerome Kern introduced him to the writer Guy Bolton, who became Wodehouse's closest friend and a regular collaborator.
what did the two collaborate on?
This was Miss Springtime (1916), which ran for 227 performances--a good run by the standards of the day.
what did they do next?
The team produced several more successes, including Leave It to Jane (1917), Oh, Boy! (1917-18) and Oh, Lady! Lady!! (1918).
were there any other successes?
Wodehouse and Bolton wrote a few more shows with other composers.
In these musicals Wodehouse's lyrics won high praise from critics as well as fellow lyricists such as Ira Gershwin.
what other composers?
CANNOTANSWER.
Did he do anything other than musicals?
Bertie and Jeeves, Lord Emsworth and his circle, and Ukridge appeared in novels and short stories.
were his novels popular?
CANNOTANSWER.

Question: did he collaborate with anyone else?
Self-contained rewrite: Besides Guy Bolton did PG Wodehouse collaborate with anyone else?