According to The Atlas of the DC Universe it is stated in page 75 that in DC continuity there is a character known as Donovan Upton, who, "is a lawyer and a founding partner of Chayney, Upton, Goldfarb, and McKenna, a prestigious New York law firm. Upton has achieved considerable wealth and infamy by defending a client list consisting exclusively of supervillains."
I thought this was an utterly brilliant premise for a character and could provide as a partial explanation as to why supervillains in the DC universe always consistently return from prison in a short amount of time.
However, when I searched the internet for this character I found little to nothing. Has Donovan Upton appeared in a DC Comic before?