Why People Dislike Really Smart Leaders
by Matthew Hutson
Scientific American
January 18, 2018

Originally Posted by article
Those with an IQ above 120 are perceived as less effective, regardless of actual performance
... based on research results published in the July 2017 issue of the Journal of Applied Psychology.

Originally Posted by article
“The wrong interpretation would be, ‘Don’t hire high-IQ leaders.’ ”
Unfortunately, while the article substantiates that high-IQ individuals may suffer from negative bias against them, it does not explore "why" this occurs. Possibly ongoing future research would reveal this:
Originally Posted by abstract
As the first direct empirical test of a precise curvilinear model of the intelligence-leadership relation, the results have important implications for future research on how leaders are perceived in the workplace.