Thielemans moved to the United States in 1952 where he was a member of Charlie Parker's All-Stars and worked with Miles Davis and Dinah Washington. In 1957 he became a U.S. citizen. From 1953 to 1959 he played guitar and harmonica with the George Shearing Quintet. With Shearing, he added whistling to his repertoire. While playing in Hamburg in 1960 on tour with Shearing, a young musician and observer —John Lennon— noticed that Thielemans played a Rickenbacker guitar. Lennon was impressed, and felt he had to have an American guitar, on the principle that "if was good enough for Thielemans it was good enough for me." Lennon and the Beatles helped make Rickenbacker world-famous.