1) Gray, Peter (1908-June 17 1981), Encyclopedia of the Biological Sciences and The Mistress Cook, professor of biology at University of Pittsburgh
2) Gray, Peter (1941- ), The Organic Horse, UK veterinarian
3) Gray, Peter (fl. 1967- ) - Battle of Hastings
4) Gray, Peter (1965- ), Discoveries: Irish Famine, Professor of Modern Irish History at Queen's University Belfast
5) Peter Gray - Briefing Book on the Nonproliferation of Nuclear Weapons
6) Gray, Peter C. (1969- ), Complete Guide to Drawing and Illustration
8) Gray, Peter (Peter Lawrence), Performance Appraisal Phrases, CEO of executive search firm based in Connecticut
9) Gray, Peter M. D. (1940- ), PROLOG and Databases, professor of Computing Science at University of Aberdeen
10) Gray, Peter (Peter O.)Peter Gray is an American psychologist and now professor emeritus at Boston College. - Psychology
11) Gray, Peter W. (1927 Oct. 11- ), Steam in Cornwall, UK photographer
12) Gray, Peter, All is Safely Gathered In, UK-born Mexico-based former Latin American Marketing Director for Proctor & Gamble
13) Gray, Peter (1953- ), Challenging Behaviour in Schools, Principal Educational Psychologist in Nottinghamshire
14) Gray, H. Peter (1924 Jul 4- ), Introduction to International Business, professor of International Economics and Business at Rutgers
16) Gray, Peter, Facing Reality, science and policy writer for the Nuclear Weapons Production Project at Friends of the Earth
17) Peter Gray - Hand Guns and Small Arms
18) Gray, Peter W., Air warfare
19) Gray, Peter, 1926- Chemical oscillations and instabilities
20) Peter Gray, (English teacher) - Phrasal Verb Fun
