Conversation so far:
Why was William J. Donovan so involved in the Nuremberg trials?
In addition to seeking justice, William J. Donovan wanted to exact retribution for the torture and killing of OSS agents.
What was William J. Donovan's involvement in World War 1
During World War I, Major William J. Donovan led the 1st battalion, 165th Infantry of the 42d Division.
Did William J. Donovan witness firsthand the crimes that were prosecuted in Nurenburg?
In one of many initiatives, William J. Donovan sent out teams of French, Danish, Norwegian, and Polish nationals to identify Gestapo officers who had tortured them
Was William J. Donovan proud of his role in the armed services?
Although he professed annoyance with the nickname, his wife knew that deep down he loved it“
Did William J. Donovan have a family?
William J. Donovan's son, David Rumsey Donovan, was a naval officer who served with distinction in World War II. His grandson, William James Donovan, served as a soldier in Vietnam.
How old was William J. Donovan when he retired?
William J. Donovan had begun experiencing symptoms of dementia while in Thailand, and he was hospitalized in 1957
Did William J. Donovan end up being governor?
William J. Donovan was widely discussed as a possible candidate for governor, but he rejected the idea, proclaiming his intention to return to Buffalo and resume the practice of law

Question: When did he practice law originally?
Self-contained rewrite: When did William J. Donovan practice law originally?