John Clayton Mayer is an American singer, guitarist, and record producer. Born in Bridgeport, Connecticut, Mayer attended Berklee College of Music in Boston, but disenrolled and moved to Atlanta in 1997 with Clay Cook.

Together, they formed a short-lived two-man band called Lo-Fi Masters. After their split, Mayer continued to play local clubs, refining his skills and gaining a following. After his appearance at the 2001 South by Southwest Festival, he was signed to Aware Records, and then Columbia Records, which released his first EP, Inside Wants Out. His following two full-length albums—Room for Squares (2001) and Heavier Things (2003)—did well commercially, achieving multi-platinum status. In 2003, he won the Grammy Award for Best Male Pop Vocal Performance for the single "Your Body Is a Wonderland".

Mayer's secondary career pursuits extend to television hosting, comedy, and writing; he has authored columns for magazines such as Esquire. He supports various causes and has performed at charity benefits. He is a watch aficionado (with a collection he values in the "tens of millions" of dollars), contributing to the watch site Hodinkee, and has been on the jury at the Grand Prix d'Horlogerie de Genève.