Maynard James Keenan (born James Herbert Keenan on April 17, 1964) is an American rock singer, songwriter, musician, record producer, winemaker, and actor. Originally from Ohio, Keenan spent his high school and college years in Michigan. After serving in the Army in the early 1980s, he attended Kendall College of Art and Design in Grand Rapids. He moved to Los Angeles, California, in 1988 to pursue a career in interior design and set construction, and formed the band Tool with Adam Jones shortly thereafter.

Keenan is best known as the lead singer of the multi-platinum rock bands Tool and A Perfect Circle with whom he has released four and three studio albums, respectively. In 2003 he created Puscifer as a side project, financing and releasing its first studio album in October 2007. Since rising to fame, Keenan has been a noted recluse, although he does emerge to support charitable causes.

In addition to his music career, he has performed improvisational stand-up comedy and ventured into acting. He is the current owner of Merkin Vineyards and the associated winery, Caduceus Cellars, and has part ownership of Stronghold Vineyards, all located in Arizona, where he lives. Among other business ventures, he is a partner in the Los Angeles restaurant Cobras & Matadors, and owns a produce market and an organic market in Cornville, Arizona, the latter featuring a tasting room for his wines as well as a food court.