Robert Hermann Breusch (April 2, 1907 – March 29, 1995) was an American number theorist, the William J. Walker Professor of Mathematics at Amherst College.
[1][3] Unable to secure a university position after receiving his doctorate, Breusch became a schoolteacher near Freiburg, where he met his future wife, Kate Dreyfuss; Breusch was Protestant, but Dreyfuss was Jewish, and the two of them left Nazi Germany for Chile in the mid-1930s.
[1][4] They married there, and Breusch found a faculty position at Federico Santa María Technical University in Valparaiso.
[1][2] The Robert H. Breusch Prize in Mathematics, for the best senior thesis from an Amherst student, was endowed in his memory.
[1] As a mathematician, Breusch was known for his new proof of the prime number theorem[1][6] and for the many solutions he provided to problems posed in the American Mathematical Monthly.