processing is of particular note, as it helped lay the foundation for the Department of Informatics at the university. In the same year, he received a Rockefeller Foundation Fellowship to study in the United States during the years 1951–1952. Selmer arrived in January 1951 as a visiting scholar at the Institute for Advanced Study in Princeton, N.J. where the IAS machine was being constructed for John von Neumann. During his stay in Princeton he also met with people such as Albert Einstein, J. Robert Oppenheimer and his countryman Atle Selberg. Einstein is said to have been the first person Selmer met on arrival in Princeton on a Saturday afternoon, and apparently took on the task as campus guide with open arms. From Princeton, Selmer traveled to Berkeley where he contributed to Paul Morton's construction of the CALDIC computer. He was hired by Consolidated Engineering Corporation (CEC) on von Neumann's recommendation in late 1951 and designed much of the logic for their Datatron computer, working closely with other CEC employees such as Sibyl M. Rock. Later the computer was named Burroughs 205 and it was the most serious competitor of IBM 650. He returned to the Institute for Advanced Study again as a visiting scholar in 1952. In late 1952, Selmer returned to Oslo, and started working on a military computer. A product of this work was implemented in a computer, which was installed in the Norwegian Defence Research Establishment in 1957. On September 25, 1953 Selmer applied for a U.S. Patent for an Electronic Adder. This patent, No. 2,947,479, was awarded on August 2, 1960. Later life At the age of mere 37 Selmer took a position of a full professor in mathematics at the University of Bergen, which was a huge feat in 1957. At the university he was involved in designing two ciphers for NATO. In 1962, a hotline between the Kremlin and Washington was established via the Norwegian-developed encryption equipment ETCRRM II (Electronic Teleprinter Cryptographic Regenerative Repeater Mixer) from STK. At the University of Bergen Selmer started studying Linear Shift Registers and lectured on the subject. He commissioned a theoretical basis for linear shift register sequences in the 1960s on behalf of the Cipher Department. His lecture notes were published several times, under the title "Linear Recurrence Relations over Finite Fields". In his lecture on EUROCRYPT'93, Ernst Sejersted Selmer gave an overview of what he had contributed