The Vineyard Movement is rooted in both historic evangelicalism and the charismatic renewal. Due to this duality, the movement uses the term "Empowered Evangelicals" (a term coined by Rich Nathan and Ken Wilson in their book of the same name) to reflect their roots in traditional evangelicalism as opposed to classical Pentecostalism. Members also sometimes describe themselves as the "radical middle" between evangelicals and Pentecostals, which is a reference to the book "The Quest for the Radical Middle," a historical survey of the Vineyard by Bill Jackson. Wimber taught and preached about spiritual gifts and healings, which allegedly began to occur in May 1980 when evangelist Lonnie Frisbee ministered.