Researchers’ findings challenge the popular image of cold and calculating Wall Street titans. : The popular image of the best hedge-fund managers as ruthless risk-takers who put profits before people could be all wrong. It turns out that hedge-fund managers with psychopathic personality traits underperform their less psychopathic peers, according to new research published Thursday by the Society of Personality and Social Psychology. Researchers analyzed 101 hedge-fund managers for so-called “Dark Triad” personality traits — psychopathy, narcissism and Machiavellianism — then looked at their investment performance over a 10-year period.