Born in Southport, Lancashire, Williams grew up in Formby near Liverpool and was educated at Holy Family High School in Thornton before studying French and Spanish at Bradford University.
[1][3] In addition to sports presenting, Williams participated in Mayo's Confessions feature.
He also styled himself as Dr. Mosh[4] on the Radio 2 show, promoting loud rock, hardcore punk and metal music, with songs from artists such as Led Zeppelin, Lawnmower Deth, Black Sabbath, Guns N' Roses and Uriah Heep.
[5] After leaving Radio 2 in December 2018, he became the head of communications at the British Equestrian Federation.
[6] He was reunited with Simon Mayo in February 2021 on the DJ's new drivetime show for Greatest Hits Radio.