Jason L. Martin, formally known as Problem, is a German-born American rapper from Compton, California. He is best known for his guest appearance on Rich Homie Quan's 2014 single "Walk Thru", which entered the Billboard Hot 100 and received received platinum certification by the Recording Industry Association of America (RIAA). Prior, he appeared on E-40's 2012 single, "Function", and Childish Gambino's 2013 single, "Sweatpants", both of which received gold certifications by the RIAA and entered the Bubbling Under Hot 100. His 2013 single, "Like Whaaat" (featuring Bad Lucc), entered the latter chart and preceded his debut extended play, Understand Me (2013)