“Clark Rockefeller” — Sociopathic conman and likely murderer

The Talented Mr. Gerhartsreiter

Phony Rockefeller
Eyed in 1985 Case – Cops Say Suspect Is German Con Man

Multiple identities.
Claim of amnesia.
Repeatedly inspired confidence.
Ease of lying.
Full expectation that lies will be believed.
Unlimited nerve.
The complete chameleon.

A special report in the Boston Globe (by Levenson & Ellement) on Clark Rockefeller:
Detailed story