Ken Gregory graduated at the University of British Columbia in 1978 with the degree of Bachelor of Applied Science in Mechanical Engineering. He worked for Schlumberger performing wireline logging in Dawson Creek, BC, Offshore Newfoundland, Beaufort Sea, NWT, and Whitecourt, Alberta from 1978 - 1982. He worked for Dome Petroleum and Amoco from 1982 to 1995, including 1989 to 1995 as an Engineering Supervisor. He worked for Sceptre Resources in 1996, and for GLJ Petroleum Consultants 1996 - 2005 as a Petroleum Engineer and 2006 - 2012 as Manager, Engineering.

Gregory joined the Friends of Science Society in 2005 when he started studying climate science. He became a director of the society and webmaster in 2009. He writes the Climate Science newsletter which is sent to members two times per month, and he also writes the Science News section of the Society’s quarterly newsletter. Both are available on the Friends of Science website.

Gregory was a director of the Seniors Alpine Ski Club of Calgary, Alberta from 2017 to May 2023 assuming the roles of Treasurer and Vice President.