 My sources for this essay—other than Prior’s published work and his papers and extensive correspondence held in the Bodleian Library, Oxford—are: (i) interviews and/or correspondence with Jonathan Bennett, John Bigelow, Ray Bradley, Colin Brown, Robert Bull, Nino Cocchiarella, Max Cresswell, Vincent Denard, John Faris, Dov Gabbay, Peter Geach, Rob Goldblatt, Jaakko Hintikka, George Hughes, Hans Kamp, Saul Kripke, Fred Kroon, Peter Øhrstrøm, Mary Prior, Stephen Read, Dana Scott, Krister Segerberg, Jack Smart, Richard Sylvan, Jim Thornton, Jim Wilson, and Georg Henrik von Wright; (ii) Cresswell and Crossley (1989), an unpublished edited transcript of a panel discussion concerning Prior held at the 1981 Annual Conference of the Australasian Association for Logic in Wellington (the participants were Robert Bull, Martin Bunder, Max Cresswell, John Crossley, Charles Hamblin, George Hughes, John Kalman, David Lewis, Michael McRobbie, Wilf Malcolm, Ken Pledger, Tom Richards, Krister Segerberg, and Pavel Tichý); (iii) an unpublished edited transcript of a conversation recorded in the Philosophy Seminar Room at Victoria University of Wellington on 6 March 1980 (the participants were Max Cresswell, Yuri Fradkin, Rob Goldblatt, George Hughes, Wilf Malcolm, and Chris Parkin); (iv) letters from Prior to Hugh Teague in 1938, kindly supplied to me by Martin Prior and now published in Grimshaw (2018); (v) letters from Prior to Ursula Bethel, 1936–1941, held in the Macmillan Brown Library, University of Canterbury, New Zealand, and now published in Grimshaw (2018); (vi) letter from Prior to Lex Miller in March 1946, held in the Lex Miller Papers at Stanford University Archives; (vii) Prior’s Knox College student files, held in the Hocken Collections, University of Otago Library, Dunedin, New Zealand; (viii) Prior’s Academic Transcript at the University of Otago, held in the Hocken Collections; (ix) Hugh Montgomery’s Academic Transcript at Canterbury University College, held in the Macmillan Brown Library, University of Canterbury; (x) University of Auckland Minutes of the Education Committee for 8 February 1971, and Department of Philosophy Annual Report for 1968, held in the University of Auckland archives (xi) MV Rangitiki Voyage Card 1938–46 (Guildhall Library, London), Movements Card 1940–45 (British National Archives, London), and Passenger List for Voyage 28 (Archives New Zealand, Wellington); (xii) Prior’s Military Records, Royal New Zealand Air Force (which contain biographical information not available elsewhere), held in the New Zealand Defence Force Personnel Archives, Upper Hutt, New Zealand; (xiii) the Annual Calendars of Canterbury University College, Christchurch, New Zealand; (xiv) Session Minute Book of St Martin’s Church, Christchurch, New Zealand, 1935–1951; (xv) Prior (2003), an interview with Mary Prior, included in the 2003 edition of Prior’s Papers on Time and Tense (Per Hasle was the interviewer); (xvi) Geach (1970), Hughes (1971), Kenny (1970), Meredith (1977), and Thomas (1968, 1971). A number of people commented helpfully on earlier versions of this material: Colin Brown, Robert Bull, Aneta Markoska-Cubrinovska, Per Hasle, George Hughes, Saul Kripke, David Lewis, Peter Øhrstrøm, Diane Proudfoot, Stephen Read, Krister Segerberg, Miriam Solomon, and Bob Stoothoff. Thanks also to Jørgen Albretsen, Kerrie Brailsford, and Les Gee.