After becoming a joint partner in 1911 of the London-based legal practice, Beaumont and Son, (originally formed as a family practice by his grandfather in 1836) Major Beaumont turned the practice's focus to aviation law following an Imperial Airways accident in 1924. He was one of the three original legal advisers on the
International Air Transport Association (IATA) (although it was then called the International Air Traffic Association) Legal Committee and served in this capacity from 1925 to 1946. In the early part of his career at the IATA, he was responsible for drafting the terms and conditions for
passenger tickets,
baggage checks and consignment notes for cargo. In 1929, Major Beaumont attended, as an observer on behalf of the IATA, a conference in
Warsaw at which the
Warsaw Convention for the unification of certain rules relating to international carriage by air was drafted. He was instrumental in persuading the conference members not to schedule to the Convention standard forms of tickets, baggage checks and consignment notes. Major Beaumont was elected Chairman of the C.I.T.E.J.A. (Comité International Technique d'Experts Juridiques Aérien) – soon to become the Legal Committee of the
International Civil Aviation Organization (ICAO) in 1946, of which he was also elected chairman whilst serving as its UK representative. The terms of his engagement were expressed by Lord Nathan thus: :
We understand that you know more about the international aspects of air law than we do at the Ministry. In these circumstances, are you prepared to attend meetings of the C.I.T.E.J.A. on the understanding that you receive no brief or instructions from us and that, if we approve of the way in which you handle these meetings, we shall receive the credit and that, if we do not approve, your employment will be terminated? He was elected President of the legal committee of the ICAO in 1954. Major Beaumont was the author of a draft Convention intended to replace the Warsaw Convention but although, to his regret, his draft was not adopted, many of its provisions appeared in the Hague Protocol 1955. He retired from the ICAO in 1957, but continued to attend meetings as an observer on behalf of the
International Chamber of Commerce and the International Law Association. Major Beaumont was the co-author of
Shawcross and Beaumont, the standard authoritative legal text on aviation. ==Figure skating==