Bob Rule, also known as "Mr. Yo-Yo", is a former Duncan demonstrator who was a protege of Barney Akers and mentor to several well-known members of the yo-yo community including Tom Kuhn and Valerie Oliver. Bob started throwing in 1948 and entered his first contest in 1949. In 1952, Barney Akers recruited him to work for Duncan part-time to run weekend contests in his native Detroit. By 1955 he was working for Duncan full-time and continued there (with a brief hiatus between 1958 and 1959) until the company folded in 1965. Bob was presented with the Harvey Lowe Lifetime Achievement Award at the 2002 World Yo-Yo Contest, and in 2004 was inducted into the American Yo-Yo Association Hall of Fame. He has an excellent web page here.