Technically, that could be a psychopath.
The psychopath can appear normal, even charming. Underneath, they lack
conscience and empathy, making them manipulative, volatile and often
(but by no means always) criminal.
This article illustrates things to a degree:
As I wrote in a recent article on Gizmodo (link is external), when I
first met tech guru John McAfee I was utterly charmed. He seemed to be
living his life with a clarity and moral courage that I found
exhilarating. The first article I wrote about him was effusive, and
when I traveled to Belize to meet up with him for a second article, I
looked forward to spending time with someone who I felt to be both
intellectually and physically adventurous. On this second trip,
however, I began to notice a troubling pattern. McAfee spent a lot of
his time bragging about the hoaxes he’d pulled off, gleefully styling
himself as a “bullshit artist.” Sometimes he lied for fun—like when he
told a reporter that his tattoo was a Maori design he’d gotten in New
Zealand, a country he’s never actually been to. Sometimes he lied
strategically, like the Facebook posting he put up about how he’d just
bought a house in Honduras. At the time, he was facing a raft of
lawsuits. "The judge in one case couldn't understand why I would put
incorrect information about myself on the web," he told me. "I said,
'I thought that if somebody wanted to serve me papers, it would be
much more enjoyable for everyone involved if they tried to serve those
papers to me in Honduras.'"
After I wrote an unflattering article about him, a number of people
from McAfee’s past reached out to me and told me even more troubling
stories. I became convinced that McAfee was not merely a disingenuous
person but a true psychopath.
Schouten says that we should not be surprised to find psychopaths
among the ranks of successful entrepreneurs like McAfee. Indeed, he
emphasizes that psychopathic traits can be positively helpful.
“Psychopathy could confer a competitive advantage, at least over the
short term,” he says. “Grandiosity and over-the-top self-confidence,
as well as skill at conning and manipulating, can go a long way toward
convincing investors of one’s vision.”