Torrence Douglas Parsons (1941–1987) was an American mathematician. He worked mainly in graph theory, and is known for introducing a graph-theoretic view of pursuit–evasion problems (Parsons 1976, 1978). He obtained his Ph.D. from Princeton University in 1966 under the supervision of Albert W. Tucker. Selected publications Notes Further reading Memorial articles in Journal of Graph Theory vol. 12 Discrete Mathematics vol. 78 1941 births 1987 deaths 20th-century American mathematicians Graph theorists Princeton University alumni