Maynard James Keenan

James Herbert Keenan, known professionally as Maynard James Keenan or MJK, is an American singer, songwriter, musician, record producer, actor, author, and winemaker. He is best known as the vocalist for the rock bands Tool, A Perfect Circle, and Puscifer. In addition to his music career, Keenan has ventured into fields such as acting, improvisational sketch comedy, and winemaking. He currently owns Merkin Vineyards and the associated winery Caduceus Cellars.