Quote from Rearden Metal:
No, actually everyone just calls him "Vic".
VN NEVER refers to himself as Dr. Neiderhoffer (Not even on his own book covers- Didn't you notice?), with one exception; He does use the "Dr." title when dealing with medical doctors. They tend to be far less careless when they think the patient is a fellow M.D.
P.S.- He's not a prick.
Ok good to know. I obviously don't even know the guy. However, when a person defends him by telling people that "you should know it is Dr., not Mr.", then something is amiss with the character of at least one of the people involved in the situation.