"Who Am I (Sim Simma)", or simply "Who Am I", is a reggae single released by dancehall artist Beenie Man in 1998. It is the second track on his album Many Moods of Moses released in 1997.The instrumental rhythm to the song, called "Playground" (a.k.a. "Playground Riddim"), was produced by Jeremy Harding, then DJ NuMark. According to Harding, "Beenie Man had heard the riddim "Playground" on several occasions and loved it.