Walter Savitch

Walter John Savitch (born February 21, 1943) is best known for defining the complexity class NL (nondeterministic logarithmic space), and for Savitch's theorem, which defines a relationship between the NSPACE and DSPACE complexity classes. His work in establishing complexity classes has helped to create the background against which non-deterministic and probabilistic reasoning can be performed.

Walter John Savitch
Born	February 21, 1943
Died	February 1, 2021 (aged 78)
Alma mater	University of California, Berkeley
Known for	Savitch's theorem, NL
Scientific career
Fields	Computer science
Institutions	University of California, San Diego
Thesis	Nondeterministic Tape Bounded Turing Machines[1] (1969)
Doctoral advisor	Stephen Cook
Website	www-cse.ucsd.edu/users/savitch/

He has also done extensive work in the field of natural language processing and mathematical linguistics. He has been focused on computational complexity as it applies to genetics and biology for over 10 years.

Aside from his work in theoretical computer science, Savitch has written a number of textbooks for learning to program in C/C++, Java, Ada, Pascal and others.

Savitch received his PhD in mathematics from University of California, Berkeley in 1969 under the supervision of Stephen Cook. Since then he has been a professor at University of California, San Diego where he is currently a professor emeritus in the computer science department.

References

1. Walter Savitch at the Mathematics Genealogy Project

External links

• Richard J. Lipton, Savitch’s Theorem. Gives a historical account on how Savitch's Theorem was discovered.