[abhas9]

"Probably" this is the study being referred:

> Hospitals led by doctors outperform those run by non-medical managers. Universities, business schools and academic departments led by good scholars outperform those that are not. The best sports teams – using data from 15,000 basketball games and 60 years of Formula 1 racing – are led by great former players or run by racing specialists.

https://www.city.ac.uk/research/impact/case-studies/evidence...