Conversation so far:
When did Ezio Pinza start performing in operas?
Pinza's Metropolitan Opera debut occurred in November 1926 in Spontini's La vestale.
Was he immediately successful?
CANNOTANSWER.
Has he worked with anyone notable?
in Spontini's La vestale, with famed American soprano Rosa Ponselle in the title role.
What other operas has he been a success in?
In 1929, he sang Don Giovanni, a role with which he was subsequently to become closely identified.
He subsequently added the Mozart roles.
Are there any other interesting aspects about this article?
Apart from the Met, Pinza appeared at the Royal Opera House.
What operas did he perform at the Royal Opera House?
CANNOTANSWER.
When did he stop performing?
Pinza retired from the Metropolitan Opera in 1948.

Question: What did he do after retirement?
Self-contained rewrite: What did Ezio Pinza do after retirement?