Dr. William Kahan

Professor

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Biography

William "Velvel" Kahan was born in Canada and studied mathematics at the University of Toronto for both his undergraduate and graduate degrees. He joined the faculty of the University of California, Berkeley, in 1968 and held a joint appointment in the Department of Mathematics as well as the new Department of Computer Science. When the two departments merged to form the Department of Electrical Engineering and Computer Sciences in 1973, he became a full professor. Kahan retired in 2008, having made significant contributions to the field of scientific computing, particularly in the development of the IEEE 754-1985 standard for floating-point arithmetic. He created a program called "paranoia" in the 1980s to test for potential floating-point bugs and developed the Kahan summation algorithm to minimize errors in adding sequences of finite precision floating-point numbers. Kahan's remarkable work in numerical analysis was recognized when he received the ACM A.M. Turing Award in 1989.

Research Interests

Requirements for University of California, Berkeley

Doctorate Program
Requirements
GPA Requirement
Required:3
GRE Subject
Overall Score
Required:500
Overall
Required:500
TOEFL
Total
Required:90
IELTS
Overall
Required:7
Prerequisites
Bachelor's degree or recognized equivalent Preparation comparable to undergraduate major at Berkeley in Mathematics or Applied Mathematics 2 full years lower-division work (Calculus, Linear Algebra, Differential Equations, Multivariable Calculus) 8 one-semester upper-division courses (Real Analysis, Complex Analysis, Abstract Algebra, Linear Algebra)
Application Checklist
  • Graduate Application
  • Statement of Purpose
  • Personal History Statement
  • Three Letters of Recommendation
  • Unofficial Transcripts
  • C.V./Resume
  • Course and Textbook List
Specialization Notes

The Mathematics Subject GRE is required for the Fall 2026 admissions cycle. General GRE is optional.