In 1933 he went on an expedition to
Abyssinia with his school contemporary
Wilfred Thesiger to trace the route of the
Awash River. In 1934, he was the ornithologist on the
Oxford University Ellesmere Land Expedition which was organised by
Edward Shackleton with the main purpose of exploring northern
Ellesmere Island and to map its coastline. The expedition was led by
Gordon Noel Humphreys who was head surveyor. Other members of the expedition were Shackleton, photographer and
biologist A. W. Moore (sometimes listed as Morris), H. W. Stallworthy of the
Royal Canadian Mounted Police, and geologist R. Bentham. With their
Greenland Inuit guides, Inutuk and Nukapinguaq, they set up camp at
Etah, Greenland in 1934. After wintering Greenland in 1934–1935, they sledged across Smith Sound and Ellesmere Island and in spring 1935. By the end of May 1935, the group had returned to Etah and reached England in late September the same year. In 1936, Haig-Thomas led an ornithological expedition to
Iceland. From 1937 to 1938, he led a British Arctic Expedition in northwest Greenland and Ellesmere Island, accompanied by John Wright and Richard Hamilton. The expedition arrived at
Qaanaaq in northwest Greenland in August 1937. They left Etah in March 1938 and crossed Ellesmere Island where they met up with the
MacGregor Arctic Expedition. They then sledged to
Amund Ringnes Island,
Axel Heiberg Island and
Haig-Thomas Island in the Canadian Arctic. They returned to Greenland and spent the summer of 1938 in Qaanaaq. ==Second World War==