I believe he was with HairClub.

About 10 years ago (or more) HairClub was opening in our city, and they had promo on local radio station. We were all listening as one coworker openly wanted to do something about his hair loss, and was all excited about this...

Anyway, "I'm not only the client" guy was patched in live with radio dj and he goes on about just how many celebrities are wearing and you'd never know, and he started talking about athlete who's ben a customer until recently when his girlfriend convinced him to go bald... and we were all (including radio dj) like "I know, it's Agassi", and he would interrupt wiht "no, no names or anything like that" but everyone knew... so I knew about it since...