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Casturo first joined Goldman in 1998 and was a key executive at the bank's commodities unit, which reported its worst quarter ever last year.
During his 20 years at the bank, he was head of oil derivatives trading in London, investor products trading in New York and metals trading.
"Don has played a leading role in helping our business to adapt to significant regulatory changes, and has advocated effectively on an array of important issues," the memo said.
The news was first reported by Bloomberg.