In every high-stakes field—sports, entertainment, medicine—the top performers have coaches. Business should be no different.

Bill Campbell, dubbed the "Trillion Dollar Coach," has mentored tech leaders including Steve Jobs. Campbell, who died in 2016, was "blunt and clear," Google exec Ruth Porat said on a recent podcast.

So great was Campbell's influence on Google's Schmidt that he, along with Jonathan Rosenberg and Alan Eagle, dubbed him the "Trillion Dollar Coach" in a book of the same name. It included ...

Bill Campbell, dubbed the "Trillion Dollar Coach," has mentored tech leaders including Steve Jobs. Campbell, who died in 2016, was "blunt and clear," Google exec Ruth Porat said on a recent podcast.