Segal is a suspicious looking man who hangs around the Black Market Bazaar in Professor Layton and the Unwound Future. It is not clear in the game but Segal is in fact married to Margaret, they seem to have a very distanced relationship.
Segal wears a light orange and dark orange suit with a white shirt underneath. He also wears a matching blue hat and trousers.
Segal gives the following puzzles in Professor Layton and the Unwound Future:
"Segal is a suspicious character who lurks in the black-market bazaar. He has watched future London evolve and grow and is likely aware of many of its secrets. Though he isn't a bad person, he somehow projects a suspicious aura."