The ever charming Edward Feser is an Associate Professor of Philosophy at Pasadena City College. Feser is also a regular contributor to the blog "What's Wrong With the World", a collection of unhinged far-right radicals (self-described "crusaders") who regularly provide, by their own shining example, a perfect demonstration of exactly what is wrong with the world.
Feser is an extreme right-wing Catholic who defends a range of repugnant views via appeal to classical natural law theory. For instance, Feser is a vicious critic of homosexuality, saying of same-sex marriage that "the very idea is a metaphysical absurdity and a moral abomination". Indeed, Feser views any sexual act that is "contrary" to the purpose of procreation as an abomination, relying on tired appeals to the "natural function" of sexual organs. Feser is curiously obsessed with where semen winds up; in short, any time one ejaculates anywhere other than inside a vagina, one is guilty of a serious moral sin (discussed here and here).
One of Feser's finest moments occurred in the immediate wake of abortion doctor George Tiller's assassination. Just a couple of days after Tiller's death, Feser blogged about the incident, referring to Tiller as a "monster" and a servant of the demon Moloch. Feser argued at length that Tiller was in every relevant way morally worse than Jeffrey Dahmer - a man who killed and/or ate 17 others and had "forfeited his right to life". Nonetheless, Feser really wants you to know that doesn't make him an apologist for Tiller's murder, because according to (his interpretation of) natural law theory, vigilantism is always wrong (discussed here, here, and here).
One might wonder whether Feser would similarly condemn vigilantism against the actual Jeffrey Dahmer (assuming we lived in a society with positive laws that permitted his actions). Given his recent defense of the claim that it is always wrong to lie, even in Nazi "murderer at the door" scenarios, it seems perhaps he actually would. Things are muddled though by his claim we are apparently morally permitted to kill the murderer at the door; we just can't lie to him (how this squares with his claim that it's NOT ok to kill a supposed mass-murderer like Tiller remains a mystery). In short, killing in self-defense = ok; lying in self-defense = no way. If you find such nonsense extremely counter-intuitive, don't worry. As Feser assures us, we shouldn't trust our moral intuitions; we just need to pay heed to (Feser's interpretation of) classic natural law.
Diagnosis: A completely unhinged and deeply insensitive loon who demonstrates just how much blind adherence to a dogma can warp one's moral sensibilities. Gives a bad name to serious academic philosophers everywhere; thankfully, his influence is probably mostly limited to the small contingent of like-minded loons who read his blogs.