Kelly was
ordained in the
Church of England as a
deacon in 1934, and served a year of a
curacy at the Church of St Lawrence, Northampton in the
Diocese of Peterborough. In 1937, Kelly was made Vice-Principal. During
World War II, he wished to become a military chaplain but Emden would not release him, and he instead undertook linguistic work for the
Foreign Office. Emden was forced to retire in 1951 because of illness and Kelly became Principal, a position he held until 1979. Kelly became Principal of the Hall at an important phase of its 700-year history, namely its independence from Queen's College, of which it had been part since 1557. The process, started by Emden in 1937, was brought to fruition in 1958 when Kelly secured the co-operation of Queen's and obtained for the Hall a Charter of Incorporation, presented by the
Duke of Edinburgh. During his tenure as Principal, Kelly oversaw a major fund-raising programme which allowed the building of new student accommodation and dining facilities. A period of illness in 1966 cut short his tenure as vice-chancellor of the University. Between 1972 and 1977 he was pro-vice-chancellor of the University. Finally, before he retired as principal, he oversaw the admission of women into the undergraduate body of the Hall, with their first matriculation in 1979. ==Academic achievements==