He is remembered for his travels in Asia, cartography, study and publication of local cultures and language, his actions on the Younghusband expedition to Tibet, Royal Geographic Society council member,[5] member of the Royal Automobile Club[6] and for his work negotiating and signing the Nepal–Britain Treaty of 1923.

[15] 1899–1903 – Appointed inspecting officer of the Kashmir Imperial Service Troops, stationed at Gilgit near the border of Afghanistan and Chinese Turkmenistan.

[1] 11 December 1903 – Departed Sikkim as interpreter, secretary and chief intelligence officer[16] to Sir Francis Younghusband's Lhasa mission as part of British expedition to Tibet.

[9] Summer 1906 – Stayed with Gertrude Bell whilst she worked on her travel book The Desert and the Sown.

[22] One was an 8hp Clement brought as a gift for Thubten Choekyi Nyima, the 9th Panchen Lama, who presided over Tashi Lhunpo monastery near Shigatse.

[7] 28 October 1913 – Met with the Edwin Montagu, Under-Secretary of State for India, at lunch arranged by Gertrude Bell, for 1.5 hour briefing and questions on the status of the frontier.

[1][27] 9 April 1918 – Sailed from the Liverpool to New York on board the SS Carpathia.,[28] taking 11 days,[27] to meet with senior military[13] and diplomats regarding the US policy in Siberia.

[1] 2 February 1930 - Article in Detroit Free Press newspaper showing O'Connor leading tiger hunt in India.

[31] 28 June 1931 – Article in The Indianapolis Sunday Star newspaper saying O'Connor inviting 5 Americans on tiger hunt for $100,000 ($20,000 each).

[1] 17 December 1943 – Funeral, St Luke's Church Office, Headley Road, Grayshott, Hindhead, GU26 6LF