Jeff Williams is a composer who creates the music for RWBY.

His involvement with Rooster Teeth started in collaboration with the band Trocadero, whose music has long been featured in web series Red vs. Blue. His own music was featured on the show beginning with singles during Revelation, and continuing in Season 9 and Season 10. His other work includes music for another Rooster Teeth show, The Strangerhood.

Jeff is a multi-instrumentalist, playing keyboards, guitar, bass, and drums. He is also an Assistant Professor at Berklee College of Music. Other artists featured in his songs include his daughter, Casey Lee Williams, as well as Lamar Hall and Sandy Lee Casey.