Conversation so far:
Where is the team Ajax located?
CANNOTANSWER.
So he was a manager for Ajax?
On 11 May 2016, De Boer announced his resignation as manager of Ajax following a disappointing season when Ajax again lost out on the Eredivisie title to PSV.

Question: What else did he do with Ajax?
Self-contained rewrite: Other than losing to the Eredivisie title to PSV, What else did Frank de Boer do with Ajax?