RJD2 is the performance name of Ramble John "RJ" Krohn: a producer, musician and singer currently working out of Philadelphia. He started his career as a DJ and acquired his artist name from a friend who called him by the nickname "RJD2" in one of his rap songs. His funky independent style now includes his own vocals and instrumentals, and he has released no less than four albums while also being on numerous mix albums and instrumentals.
One of RJD2's latest albums, The Colossus, is certainly not the last project he has worked on. Under the artist name "The Insane Warrior," Krohn has released a purely instrumental homage to old science fiction movies with the album We Are the Doorways in 2011. He performs live throughout the US and, occasionally, worldwide.