Chris Jackson is a composer and Broadway performer who has composed songs for Sesame Street (beginning in Season 41) and resource videos. He also provided the voice for the Justin Bieber Muppet in the song "Measure, Yeah, Measure."
In Sesame related credits, Jackson sang the original song "Puppet Man" (written by Mark Radice) in the documentary Being Elmo: A Puppeteer's Journey and composed music for the revival of The Electric Company.
As a performer, Jackson has appeared on Broadway in The Lion King (understudying Simba), In the Heights, and Hamilton (both with Lin-Manuel Miranda) while TV credits include episodes of White Collar and Nurse Jackie. His wife, Veronica Vazquez-Jackson, voiced the Mercedes Muppet in the Glee parody from season 42.
In 2016, Elmo appeared alongside Jackson in a viral video from the set of the musical, Hamilton. (YouTube)