Elbernita "Twinkie" Clark is an American gospel singer, composer, musician, and evangelist. She is a member of The Clark Sisters, an influential gospel vocal ensemble active since the late 60's. Clark has been The Clark Sisters' creative force since their mother Mattie Moss Clark turned over control of the group to her in the early 1970s. An accomplished pianist and organist, Clark received formal training in piano from Howard University and is dubbed as the "Queen of the Hammond B3" organ.