MJK, is a musician, record producer, winemaker, and actor, best known as the vocalist for Grammy Award-winning progressive metal band Tool.
He is also the lead singer of A Perfect Circle & Puscifer.

In addition to his music career, he has performed improvisational sketch comedy and ventured into acting.
He currently owns Merkin Vineyards and the associated winery, Caduceus Cellars, which are located in Arizona, where he lives.
Among other business ventures, he is a partner in the Los Angeles restaurant Cobras & Matadors, and also owns an organic produce market in Cornville, Arizona, which features a food court and a tasting room for his wines.

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