Malcolm John "Mac" Rebennack.

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Malcolm John "Mac" Rebennack. (born November 21, 1940), better known by the stage name Dr. John, is an American singer-songwriter, pianist and guitarist, whose music combines blues, pop, jazz as well as zydeco, boogie woogie and rock and roll. Active as a session musician since the late 1950s, he gained a cult following in the late 1960s following the release of his album Gris-Gris and his appearance at the Bath Festival of Blues and Progressive Music. He came to wider prominence in the early 1970s with a wildly theatrical stage show inspired by medicine shows, Mardi Gras costumes and voodoo ceremonies. Rebennack has recorded over 20 albums and in 1973 scored a top-20 hit with the jaunty funk-flavored "Right Place Wrong Time", still perhaps his best-known song.