Swami Prem Amitabh (Robert Birnbaum), one of the therapists in the Poona ashram, estimates that there were about 100,000 sannyasins by 1979.[35] Bob Mullan, a sociologist from the University of East Anglia, states that "at any one time there were about 6,000 Rajneeshees in Poona, some visiting for weeks or months to do groups or meditations, with about two thousand working and living on a permanent basis in and around the ashram."[35] Lewis F. Carter, a sociologist from the Washington State University, estimates that 2,000 sannyasins resided at Rajneeshpuram at its height.[35]