halacha - Who is worthy of reciting the blessing "שנתן מחכמתו לבשר ודם" on?

On whom does one recite the blessing "שנתן מחכמתו לבשר ודם" (the blessing recited on non-Jewish scientists)?

• Does he have to be a Ph.D? Does he have to have inventions to his name?


• Did he have to learn in a prestigious college (like MIT)?


• Can he just be a philosophy student?


• Can one an "expert technician" (which does involves some intellectual skills)?


• What if he's evil, would you say a blessing on a Nazi scientist?

Inspired by Upon whom would one make this blessing?