For the following three years, Mr. Brewster was back at Harvard, serving as an assistant professor of law, and was promoted to full professor in 1953. He was an expert on antitrust matters as well as on international commerce and relations.
接下來的三年,布魯斯特先生又回到哈佛任教,成為一名法律專業助理教授, 1753年晉升為教授。他是反托拉斯事務及國際貿易與國際關系方面的專家。
Afterwards, Mr. Brewster returned to Yale at the invitation of its then president, A. Whitney Griswold, who was his teacher when Mr. Brewster was an undergraduate and who chose him to succeed the president position. From 1960 to 1963, Mr. Brewster was a professor of law at Yale as well as provost-designate and later provost-then the second highest officer of the university. Mr. Griswold died in April 1963, and Mr. Brewster assumed the duties of president as well as provost until late in the year he was formally elected president by Yale's trustees, who had deliberated for months. That period, he later recalled wryly, was "a very itchy time."
之后,受當時耶魯大學校長惠特尼·格里斯華爾德之邀,小金曼·布魯斯特重返耶魯。惠特尼·格里斯華爾德校長是他在耶魯讀書時的老師,有意挑選小金曼·布魯斯特繼任校長之職。1960至1963年期間,布魯斯特先是擔任法律系教授和耶魯大學教務長繼任者之職,后來成為正式的教務長。教務長的職位在當時的耶魯領導層中排第二位。格里斯華爾德校長于1963年4月去世,布魯斯特代理了校長及教務長的所有工作,直到當年年底,耶魯的理事們經過幾個月的仔細商議,才正式選舉布魯斯特為耶魯大學校長。布魯斯特后來回憶道,那是一段"令人不安的時期"。

His presidency at Yale was from 1963 to 1977 when he was nominated by President Jimmy Carter on April 7,1977 to serve as U.S. Ambassador to the Court of St. James. Mr. Brewster accepted and was succeeded as Yale's president by Mr. Giamatti.
小金曼·布魯斯特的任期1963年起,一直持續到1977年,當時的美國總統吉米卡特任命他擔任美國駐英國大使。他接受了任命,并由嘉馬地先生接任耶魯校長之職。
After stepping down as Ambassador in 1981,Brewster began working with the New York-based law firm of Winthrop, Stimson, Putnam & Roberts. In 1984, he became its resident partner in London.
1981年,從大使職位上退下來后,他又與紐約的溫斯洛普、斯廷森、帕特南、羅伯茨法律事務所合作,并于1984年成為其在倫敦的常駐代表。
Then, in April 1985,he returned to academe and was elected to be master of University College, Oxford, serving from 1986 until his death there in 1988 due to a brain hemorrhage.
1985年4月,他重返學術界,被選為牛津大學大學學院的院長,任期自1986年起, 直到他1988年因腦出血去世。