He developed an interest in British Folk music at an early age, and pursued the fiddle and other stringed instruments. He studied music in New York through his college years, taking lessons from noted jazz and bluegrass violinist Matt Glaser, and learning Country and Appalachian music on the streets of Greenwich Village and the mountains of New York, West Virginia and Pennsylvania. In the early 1980s he spent time in Europe studying Gypsy violin, returning to New York City in 1981 and settling in the Punk rock infested East Village. Shortly after he became involved in the Pagan community, meeting and eventually marrying Blue Star Priestess Tzipora Katz.
In the mid-1980s Kenny and Tzipora, as they were known, recorded several projects on Kicking Mule Records, including the album Wineskins, Tinkers, & Tears in 1985. Together with their children they traveled around the US, performing at pagan festivals, renaissance fairs, and folk music venues.
In 1992 Kenny and Tzipora divorced, and Kenny began his solo music career, subsequently releasing several projects on Blackthorn Records, and returned to performing music at renaissance festivals throughout the U.S. In 1998 he released the CD Muses, an album of all original music produced by Brewers' Witch Productions.
Klein currently lives in Los Angeles, California, and works with Enrichment Works, a non-profit organization that brings performance art to public schools in the Los Angeles area. He originated the role of Ike in Gold Rush Honeymoon for Enrichment Works, and also appeared in his original one-man show, Wandering Minstrel, for the organization. He plays both as a solo musician and with the band "The Long Goners" (who currently records for CMH Records) AKA "Junia May and the Hymns", with various Country and Blues bands (including his own band "Blues For Dixie"), and at renaissance fairs, Neopagan festivals, clubs and bars. His latest project, Meet Me In The Shade of the Maple Tree, is arguably the world's first CD of Pagan Bluegrass Gospel music.
Through his interest in British music, Klein discovered the Wiccan and Neopagan communities. He learned a great deal about traditional Scottish Witchcraft from New York merchant Eileen Campbell Gordon, and then joined the Blue Star coven and tradition of Wicca, becoming a High Priest within that tradition in 1983. He helped steer the Tradition towards a more traditional British form, discarding Alexandrian and ceremonial rituals and replacing them with British folkloric Craft practices, including the 8 Paths of Power, the 7 Tenets of Faith, and the Drawing Down of the Moon and Sun. Between 1983 and 1992 he and his wife, High Priestess Tzipora Klein (née Katz) were largely responsible for transforming Blue Star from a local coven to a Wiccan tradition of its own. Touring the country during that period performing music, Kenny and Tzipora continued to teach Blue Star Wicca, initiating many people and founding many covens, at the same time recording and distributing lessons on cassette tapes, and Klein has continued to teach Traditional Wicca since then. In 1992, after separating from Tzipora, he established the Rose and Antler coven of Blue Star, through which he continues to practice and teach. He is the author of The Flowering Rod: Men, Sex and Spirituality, a book on Wicca and Men's Mysteries.