Known as "The Great Imposter," which conman moonlit as a zoologist, civil engineer, and a Trappist monk?

"The Great Imposter," Ferdinand Demara, stole identities, impersonating everyone from a civil engineer to a prison warden, to a zoologist, to a Trappist monk. According to some, fame brought his downfall, when he saved wounded soldiers while posing as a doctor during the Korean War. Rookie mistake: gotta keep it low-profile when you're impostering.

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