In 2007, Henderson signed on as an official supporter of Little Kids Rock, a nonprofit organization that provides free musical instruments and instruction to children in under-served public schools throughout the USA. He sits on LKR's Honorary Board of Directors. Other charitable endeavors include providing signed auction items for the Grammy foundation and musicares.
In August 2009, Henderson filmed the guitar instructional video, "Rock Guitar Heroics" in Santa Rosa, CA.
Marcus Henderson has also contributed other works to various games most notably vocals in "I Wanna Be Sedated" by the Ramones, as well as the bass track in Pantera's "Cowboys From Hell" from Guitar Hero. He is credited on the Halo suite with Steve Vai for the Video Games Live Vol 1. CD He was also one of the four main consultants on song selection for the award winning Guitar Hero II setlist. He also recorded the guitar tracks for the EA game 1louderthan10 2011 update as the "Bergen Hammer" and provided Heavy Metal guitar sounds for the game as well as providing various video lesson and audio licks for BandFuse: Rock Legends.
