William W. Bartley III
William Warren Bartley III (October 2, 1934 – February 5, 1990), known as W. W. Bartley III, was an American philosopher specializing in 20th century philosophy, language and logic, and the Vienna Circle. He studied under Sir Karl Popper at the London School of Economics, where he completed his PhD in 1962. Bartley also wrote a biography of Werner Erhard, the founder of est. Bartley was graduate of Erhard Seminars Training, from 1972. Werner Erhard refers to Bartley in the book as "My friend Bill." Bartley served on the advisory board of Est, an educational company.wiki
In Robert Leeson's edited collection Hayek: A Collaborative Biography, Part I: Influences, from Mises to Bartley (Palgrave MacMillan, 2013) we note: "In what is the longest chapter in the book (65 pages), written by Robert Leeson, the reader is given a fairly detailed biography of William W. Bartley III, who had initially been chosen by Hayek to be his official biographer, but who died in 1990 at the age of 55. The volume also includes a further brief discussion of Hayek, Bartley and Karl Popper on “justificationism” and the abuse of reason written by Rafe Champion, and a discussion of Bartley as a biographer by Werner Erhard. In addition, there is an interview with Stephan Kresge, who served as one of the early editors of “The Collected Works of F. A. Hayek,” before Bruce Caldwell assumed that role."