Robin Cope Hartshorne (/ˈhɑːrts.hɔːrn/ HARTS-horn; born March 15, 1938) is an American mathematician who is known for his work in algebraic geometry.

He received a Ph.D. in mathematics from Princeton University in 1963 after completing a doctoral dissertation titled Connectedness of the Hilbert scheme under the supervision of John Coleman Moore and Oscar Zariski.

[7][8] In 1979, Hartshorne was awarded the Leroy P. Steele Prize for "his expository research article Equivalence relations on algebraic cycles and subvarieties of small codimension, Proceedings of Symposia in Pure Mathematics, volume 29, American Mathematical Society, 1975, pp.

[10] Hartshorne attended high school at Phillips Exeter Academy, graduating in 1955.

Hartshorne is married to Edie Churchill and has two sons and an adopted daughter.