Jeff Williams was the keyboardist in Trocadero, and like his band is a composer for Rooster Teeth. He did most of the music for the seasons 8 through 10 of Red vs. Blue,, and followed it by becoming the sole composer in RWBY, working closely with Lamar Hall, his (now ex) wife Sandy Lee Casey, and his daughter Casey Lee Williams, as well as composing the RWBY scores with Alex Abraham and Steve Goldshein. He also worked in the score for X-Ray and Vav. His Rooster Teeth profile is williams.
- Although he appears on some Rooster Teeth panels at events he rarely ever, or does not, talk.
- One exception being the RWBY Music Panel where he will actively speak for the majority of the panel.
- His music has regularly been featured at the end of Rooster Teeth videos:
- "Agent Texas" (Red vs Blue season 8) and "Can't Trust Anybody" (Red vs Blue season 9) played at end of videos on RT's YouTube channel.
- The original Rooster Teeth Animation end bumper (2015-6) had the coda of "Best Day Ever" (RWBY Volume 2 score)
- The current Rooster Teeth Animation end bumper (2017-) features the coda of "R.W.B.Y. vs. F.N.K.I." (RWBY Volume 3 score).