John Leeson
John Leeson John Leeson at The Television & Movie Store, Norwich, England, on 20 September 2008. Born John Francis Christopher Ducker (1943-03-01) 1 March 1943 (age 71) Leicester, Leicestershire, England Occupation Actor/ Freelance wine educator Known for K-9 in Doctor Who John Leeson (born 1 March 1943) is a British actor who is best known for voicing K-9 on the television series Doctor Who from 1977 to 1979, then from 1980 to 1981, and has returned for two single episode in the revived series. He also voiced K-9 in the show's spin-offs K-9 and Company, The Sarah Jane Adventures and K-9.