Conversation so far:
Can you tell me about Paul Klee and his mature career?
In 1919, Klee applied for a teaching post at the Academy of Art in Stuttgart.
Did Paul Klee get the position of teching post at Stuttgart?
This attempt failed but he had a major success in securing a three-year contract (with a minimum annual income) with dealer Hans Goltz

Question: Did he keep the contract?
Self-contained rewrite: Did Paul Klee keep the contract with Hans Goltz?