Maynard James Keenan [James Herbert Keenan] was born April 17, 1964, to a Baptist family in Ravenna, Ohio. He has been a member of the band Tool since 1990 and was a member of the band A Perfect Circle from 1999 to 2005.

             He joined the Army in 1982. By the age of 18, he had lived in Ohio, Michigan, New Jersey, New York, Oklahoma, Kansas and Texas. He went to serve in the army to be a forward observer. He then studied at the United States Military Academy Preparatory School from 1983 to 1984. He ran cross-country and sang in the glee club while in college. He was accepted to West Point, but chose not to attend. Instead, he chose to complete his active duty term of enlistment. He then left the military to study art at Kendall College of Art and Design in Grand Rapids, Michigan. Before his years with Tool, Keenan sang for Green Jelly and Children of the Anachronistic Dynasty, and played bass guitar for TexA.N.S..

            Maynard moved to Los Angeles in 1980. He joined the band Tool with guitarist Adam Jones and bassist Paul d'Amour. The lineup was not completed until Keenan's neighbor drummer Danny Carey agreed to join.

           Opiate was released in 1992, and Tool toured with the bands Fishbone and Rage Against the Machine. In 1993, they released their debut album, Undertow, which eventually gave the band great success. Keenan's lyrics and vocals were melodic, grim, and angst-ridden. His lyrics evolved into increasingly introspective and spiritual works that focused not only on anger but on the positive benefits of transcending it.

            Maynard used his voice to help with issues that he was against. For example, he made an appearance at a benefit concert for Tori Amos' RAINN (the Rape, Abuse & Incest National Network) in 1997.

            After the release of AEnima the band found themselves in a legal battle with their record label, Volcano Records. The members of Tool decided to take some time off. During this time, Keenan found time to work with Billy Howerdel, and they formed the band, A Perfect Circle. APC  began performing in 1999 and released its first album, Mer de Noms, in 2000. in 2003, they released Thirteenth Step. One year later, A Perfect Circle released the album eMOTIVe.

            February 2005, Maynard appeared as a surprise vocalist at a Seattle benefit concert for victims of the recent tsunami in southern Asia. He performed with the partly reformed Alice in Chains in place of vocalist Layne Staley on the songs Them Bones, and Man in the Box.

            Keenan is single ladies!!! He has one son named Devo, who was born August 5, 1995. He was engaged to Jennifer Ferguson, but they split before marrying. Keenan is very family oriented.

            Keenan knows a lot about wine, and therefore owns a couple of places. He owns Merkin Vineyards and Caduceus Cellars, in Cornville, Arizona.