Ivan Rival (March 15, 1947 – January 22, 2002 in Ottawa, Ontario, Canada) was a Canadian mathematician and computer scientist, a professor of mathematics at the University of Calgary and of computer science at the University of Ottawa.
As a computer scientist at Ottawa, he shifted research topics, applying his expertise in order theory to the study of data structures, computational geometry, and graph drawing.
[1][4] After postdoctoral stints visiting Robert Dilworth at Caltech and Rudolf Wille at the Technische Hochschule Darmstadt, he took a faculty position at Calgary in 1975, and was promoted to full professor in 1981.
In 1986, he moved to the University of Ottawa, where he became chair of the computer science department.
[1] Rival's doctoral students included Dwight Duffus,[1][4] the Goodrich C. White Professor of Mathematics & Computer Science at Emory University.