In danger of losing his draft deferment, Everett took a research job with
the Pentagon the year before completing the
oral exam for his PhD and did not continue research in theoretical physics after his graduation. He started defense work in the
Weapons Systems Evaluation Group (WSEG) in June 1956. Completing his PhD within a year of starting at WSEG was a job requirement, and in April 1957 he returned briefly to Princeton to defend his thesis. The
oral examination took place on April 23. The principal examiners—Wheeler,
Valentine Bargmann, H. W. Wyld, and Dicke—concluded: "The candidate passed a very good examination. He dealt with a very difficult subject and defended his conclusions firmly, clearly, and logically. He shows marked mathematical ability, keenness in logic analyses, and a high ability to express himself well." A short article, which was a compromise between Everett and Wheeler about how to present the many-worlds concept and almost identical to the final version of his thesis, was published in
Reviews of Modern Physics, accompanied by a favorable review by Wheeler. Everett was not happy with the article's final form. During March and April 1959, Everett visited
Copenhagen at Wheeler's request in order to meet with
Niels Bohr, the "father of the
Copenhagen interpretation of
quantum mechanics". The visit was a complete disaster; Bohr "rejected Everett’s approach as a whole, defending the Copenhagen approach to measurement". The conceptual gulf between their positions was too wide to allow any meeting of minds;
Léon Rosenfeld, one of Bohr's devotees, called Everett "undescribably stupid" and said he "could not understand the simplest things in quantum mechanics". Everett later described this experience as "hell...doomed from the beginning". In August 1964, Everett and several WSEG colleagues started Lambda Corp. to apply military modeling solutions to various civilian problems. During the early 1970s, defense budgets were curtailed and most money went to operational duties in the
Vietnam War, resulting in Lambda eventually being absorbed by the General Research Corp. In 1973, Everett and Donald Reisler (a Lambda colleague and fellow physicist) left the firm to establish DBS Corporation in
Arlington, Virginia. Although the firm conducted defense research (including work on
United States Navy ship maintenance optimization and weapons applications), it primarily specialized in "analyzing the socioeconomic effects of government
affirmative action programs" as a contractor under the auspices of the
Department of Justice and the
Department of Health, Education and Welfare. For a while, the company was partially supported by
American Management Systems, a business consulting firm that drew upon algorithms Everett developed. He concurrently held a non-administrative vice presidency at AMS and was frequently consulted by the firm's founders. Everett cultivated an early aptitude for
computer programming at IDA and favored the
TRS-80 at DBS, where he primarily worked for the rest of his life. == Later recognition ==