Sidney Martin Webster (born 12 November 1945 in Danville, Illinois) is an American mathematician, specializing in multidimensional complex analysis.
[1] After military service, Webster attended the University of California, Berkeley as an undergraduate and then as a graduate student, receiving a PhD in 1975 under the supervision of Shiing-Shen Chern[1] with thesis Real hypersurfaces in complex space.
[3] In 2001 he received, jointly with László Lempert, the Stefan Bergman Prize from the American Mathematical Society.
[1] In 2012 Webster was elected a Fellow of the American Mathematical Society.
In 1977 he proved a significant theorem on biholomorphic mappings between algebraic real hypersurfaces.