Which of these artists has NOT been a member of dancehall group Major Lazer?

Skrillex has not been a member of the dancehall group Major Lazer. While he has collaborated with Major Lazer and worked on several tracks with them, Skrillex is not an official member of the group. He is primarily known for his own solo electronic music career, and Major Lazer is a collective made up of Diplo, Jillionaire, and Walshy Fire.