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Biography of Robert Pertsch Gilbert

Born on January 8th, 1932 in the Bronx, New York, Bob Gilbert grew up with his younger sister, Ann, and his parents Ralph and Ruth (Pertsch) Gilbert. He became familiar with the German language and German culture thanks to his mother and maternal grandmother, Anna (Ruesterholz) Pertsch. But the roots of his paternal family go back much further, to Barons Giselbert and D’Haskelville in 11th-century Normandy. This partially explains why France became one of Bob’s favorite countries, where he enjoys spending sabbaticals and the French culture. In 1952, Bob graduated in his home town as a bachelor of science at the Brooklyn College of the City University of New York. Like many excellent mathematicians, Bob started as a physicist. In 1955, he earned his master degrees at Carnegie Mellon in both Physics and Mathematics. As a graduate student at Carnegie Mellon he began to work on a free-boundary problem under the guidance of Hirsh Cohen, who later became a president of SIAM. This resulted in a joint publication with Hirsh Cohen in 1955. When Cohen left Carnegie Mellon for Rennselear, Bob worked under Zeev Nehari, a prominent complex analyst in the 1950s. With him he earned his Ph.D in 1958 at the Carnegie Mellon University in Pittsburgh. Hence, among his mathematical ancestors are Karl Theodor Weierstrass and Carl Friedrich Gauss. Influenced by Zeev Nehari, and motivated by his own interest in mathematical physics, Bob became an applied analyst with complex methods as one of his favorite tools. In his Ph.D. thesis Bob generalized J. Hadamard’s ‘‘multiplication of singularities theorem’’ and used this to study the singularities of harmonic functions. For this purpose, he used an integral operator method due to Stefan Bergman for determining the analytic and singular behavior of solutions to various classes of elliptic partial differential equations. The Bergman-Whittaker operator B3 generates harmonic functions in R from functions f of two complex variables. Bob gave necessary and sufficient conditions for the generated harmonic function B3(f) to be singular in terms of the analytic function f. His generalization to harmonic functions in R are based on an integral operator later called the Gilbert operator. After his first year as an instructor and assistant professor at the University of Pittsburgh while also working as a consultant for the U.S. Bureau of Mines, Special Coal Division, Bob spent one year at Michigan State University before joining the Institute for Fluid Dynamics and Applied Mathematics at the University of Maryland as a research assistant professor in 1961. In 1964 he became research associate professor at that institute. While at Maryland he was also engaged as a consultant at the Naval Ordnance Laboratory, White Oak. Bob systematically