At their key, A Course in Wonders is a channeled work, and their sources are shrouded in mystery. Helen Schucman, a clinical psychologist, and Bill Thetford, a research psychologist, worked in the 1960s to transcribe the inner dictations that Schucman said for from an interior style she recognized as Jesus Christ. The process of receiving and recording these communications spanned seven decades and resulted in the three-volume book known as A Program in Miracles.