| 1913 March 2 | Born Brandon, Manitoba |
| Education | Winnipeg Public School Saskatoon High School University of Saskatchewan - B. Eng. 1935 - M.Sc. (Mech. Eng.) 1938 |
| 1938 | Canadian General Electric Test Course |
| 1939 | University of Saskatchewan - Lecturer in Engineering |
| 1939-45 | RCAF (retired as Wing Commander) |
| 1945-6 | Associate Director-General, Research and Development Division, Department of Reconstruction and Supply, Ottawa |
| 1946-48 | Montreal Armature Works Limited, Montreal |
| 1948 | Scientific Assistant to the President, National Research Council |
| 1949 | Chief of Administration, National Research Council - Chalk River Project |
| 1952 | General Manager - Atomic Energy of Canada Limited |
| 1954 | Vice-President, Administration and Operations, AECL |
| 1958-74 | President, AECL |
| 1961 | D. Sc. University of British Columbia LL.D. University of Saskatchewan |
| 1962-73 | Member, Board of Governors, Carleton University (Chairman 1970-73) |
| 1969 | Appointed a Companion of the Order of Canada |
| 1973 | Awarded the Professional Engineers Gold Medal by the Association of Professional Engineers of Ontario |
| 1987 March 2 | Died in Deep River, Ontario |
See also Early Decisions in the Development of the CANDU Program by J.L. Gray, from the Nuclear Journal of Canada, Volume 1, No. 2, June 1987, published by the Canadian Nuclear Society.