 Readers wanting additional information about Russell’s life are encouraged to consult Russell’s five autobiographical volumes: Portraits from Memory and other Essays (A1956b), My Philosophical Development (1959) and The Autobiography of Bertrand Russell (3 volumes, 1967, 1968, 1969). In addition, John Slater’s accessible Bertrand Russell (1994) gives a short but informative introduction to Russell’s life, work and influence. Other sources of biographical information include Ronald Clark’s authoritative The Life of Bertrand Russell (1975), Ray Monk’s two volumes, Bertrand Russell: The Spirit of Solitude (1996) and Bertrand Russell: The Ghost of Madness (2000), and the first volume of Andrew Irvine’s Bertrand Russell: Critical Assessments (1999).