Nathan Joseph Harry Divinsky (October 29, 1925 – June 17, 2012) was a Canadian mathematician, university professor, chess master, chess writer, and chess official. Divinsky was also known for being the former husband of the 19th Prime Minister of Canada, Kim Campbell. Divinsky and Campbell were married from 1972 to 1983.
He was born in Winnipeg, Manitoba, in 1925, and was a contemporary and friend of Canadian Grandmaster and lawyer Daniel Yanofsky. Divinsky received a Bachelor of Science from the University of Manitoba in 1946. He received a Master of Science in 1947, and a PhD in Mathematics under A. A. Albert in 1950 from the University of Chicago after which he returned to Winnipeg and was on the staff of the Mathematics Department of the University of Manitoba for most of the '50s. Divinsky then moved to Vancouver where he served as a mathematics professor, and also as an assistant dean of science, at the University of British Columbia in Vancouver, where he spent the remainder of his professional career.
He was featured in many segments relating to mathematics and chess on the Discovery Channel Canada program @discovery.ca, now called Daily Planet. During the first two seasons of the show, he presented a weekly contest segment emphasizing math puzzles.
Divinsky served on the Vancouver School Board, from 1974–80, and was the Chair from 1978–80. He served as an alderman on Vancouver's city council from 1981–82.