'Garrett Hamler (born March 30, 1979), better known as Sean Garrett, is an American singer, songwriter, and record producer. He has produced eighteen number one singles in only seven years of producing music. That number puts him in fifth place on the Billboard list of producers with the most number one hits. Garrett is the first producer to achieve this measure of success in under a decade since George Martin, who produced 20 #1 hits for The Beatles in 6 1/2 years from 1964 to 1970. He is also the only active hip hop producer that is mentioned on the Billboard list of producers with the most number one hits.