Karl Longin Zeller (December 28, 1924, Šiauliai, Lithuania – July 20, 2006, Tübingen) was a German mathematician and computer scientist who worked in numerical analysis and approximation theory.[1] He is the namesake of Zeller operators.
Zeller was drafted into the Wehrmacht, and lost his right arm on the Soviet front of World War II.[1] He earned his Ph.D. from the University of Tübingen in 1950, under the supervision of Konrad Knopp and Erich Kamke, and remained at Tübingen for most of his career as a professor and as director of the computer center. He left Tübingen in 1959 for a professorship in Stuttgart but returned to Tübingen in 1960 with a personal chair in "the mathematics of supercomputer facilities" (German: Mathematik der Hochleistungsrechenanlagen), making him one of the founders of computer science in Germany.[1] He has over 200 academic descendants.
In 1993, he was given an honorary doctorate by the University of Siegen.[1]