Sean Desai is the only defensive coordinator in the sport with this in his Wikipedia page:
…received his undergraduate degree in philosophy and political science, with a minor in biology, from Boston University in 2004. Desai earned a master’s degree in higher and postsecondary education from Columbia University in 2005. Desai earned his doctorate in educational administration in 2008 at Temple University, and was an adjunct professor for two years.
Now, that passage would not exactly qualify him to be the defensive coordinator of a professional football team. But Desai has been praised for his schematic acumen, has earned the love of the guys in the locker room, and comes with a resounding endorsement from Vic Fangio.