Following graduation in 1953, Johnson secured a brief position with the office of Senator
John F. Kennedy of Massachusetts, where she worked on research regarding
French Indochina. She also spent time with
Truman Capote, who captured some of their experiences in his 1956 non-fiction book
The Muses Are Heard. Her observations on Soviet fashion and Soviet attitudes regarding Western fashion were profiled in
The Boston Daily Globe. While there she also acted as a translator at the
Embassy of the United States, Moscow. Johnson transitioned to journalism, and from 1958 to 1960 she was stationed in Moscow, where she filed stories for the
North American Newspaper Alliance. An executive with the Alliance described her performance there: "Priscilla was the kind of correspondent the Russians were wary of in those days. She knew too much about Soviet history, law, and politics to be bamboozled by propaganda handouts from the [Soviet government]. And with her expert knowledge of the language she could fine-comb the Russian press for story leads." She talked with him for five or six hours. The story she wrote that appeared in North American papers began with Oswald saying, "For two years now I have been waiting to do this one thing. To dissolve my American citizenship and become a citizen of the Soviet Union." The piece consisted of Johnson describing Oswald's past life and the difficulties of defecting, and quotes of Oswald's
Marxist-derived explanations of why he wanted to move to a different politico-economic system. On
November 22, 1963, Johnson was first shocked by the news of Kennedy's death, and then a second time by the identification of the suspect arrested, exclaiming to a friend: "My God, I know that boy!" Because of her interview with Oswald, she was called to testify before the
Warren Commission that investigated the assassination. ==Author and scholar==