 Complete the following phrase:  In 1961, Billings declined Kennedys offer to appoint him the first head of the Peace Corps, director of a new agency to promote tourism, the U.S. Travel Service, or ambassador to Denmark. He later said: I realized that I did not want to work for the president  because I felt it would change our relationship. In September 1961, he accepted an appointment to the board of trustees of the planned National Cultural Center, which later became the Kennedy Center. The next year, Kennedy named him to a board to plan Americas participation in the 