|From||United States of America|
|Birth||13 February 1906, Bricelyn, Faribault County, Minnesota, USA|
|Death||31 May 1991, Los Angeles, Los Angeles County, California, USA (aged 85 years)|
Magnus Rudolph Hestenes (February 13, 1906 – May 31, 1991) was an American mathematician best known for his contributions to calculus of variations and optimal control. As a pioneer in computer science, he devised the conjugate gradient method, published jointly with Eduard Stiefel.
Born in Bricelyn, Minnesota, Hestenes earned his Ph.D. at the University of Chicago in 1932 under Gilbert Bliss. His dissertation was titled "Sufficient Conditions for the General Problem of Mayer with Variable End-Points." After teaching as an associate professor at Chicago, in 1947 he moved to a professorship at UCLA. He continued there until his retirement in 1973, and during that time he served as department chair from 1950–58. While a professor, Hestenes supervised the thesis research of 34 students, among them Glen Culler, Richard Tapia and Jesse Wilkins, Jr..
Hestenes received the Guggenheim (1954) and Fulbright awards, was a vice president of the American Mathematical Society, and was an invited speaker at the 1954 International Congress of Mathematicians in Amsterdam.
He died on May 31, 1991 in Los Angeles, California.