1. Christopher Smyth Simons (Princeton PhD 1997) 1970-
2. John Horton Conway (Cambridge PhD) 1937-
3. Harold Davenport (Cambridge PhD) 1907-1969
4. John Edensor Littlewood (Cambridge PhD) 1885-1977
5. Ernest Barnes (Cambridge Sc.D.) 1874-1953
6. Walter William Rouse Ball (Cambridge ?) 1850-1925