Grenell, you may recall, was briefly a spokesman for Mitt Romney's 2012 presidential campaign. Anti-gay religious conservatives were successful in hounding Grenell out of the post because of his sexual orientation. There was nothing subtle about their campaign. Grenell and Romney parted company after only 25 days together (Romney never was a profile in courage).
Grenell has a BA from the conservative Christian Evangel College (now Evangel University). It begs the question of whether a gay man chose to attend an anti-gay college or if he accepted his sexual orientation during his time at Evangel. Grenell then went to the dark side and obtained a master's degree in Public Administration from Harvard University.
For nearly five years of the Obama administration this post was held by Ivo Daalder who seems to have been more qualified. Grenell was an early supporter of Trump.