John Derek Yancey (born October 13, 1986) better known by his stage name Illa J, is a rapper, singer, producer and songwriter from Detroit, Michigan who has released several albums on Delicious Vinyl Records. He is the younger brother of the late Hip-Hop artist J Dilla, and currently an active member of hip hop group Slum Village and is also one half of the hip hop duo Yancey Boys along with Frank Nitt.