A.T. Cooke presented a "very interesting series" of identified moths from the Transvaal to the South African Museum, Cape Town, in 1907, including 33 species new to the museum's collection. The next year he sent in numerous Transvaal Lepidoptera, many named by, or co-types of species described by, Sir George Hampson* of the British Museum. Cooke was described in the South African Museum's Report for 1908 as "a very able collector" and as living at Klip River, Transvaal (a railway station halfway between Germiston and Vereeniging). That year he also presented some freshwater fishes to the museum. In 1909 he again sent in identified Transvaal moths, several of which were new to the museum, as well as some Coleoptera (beetles).
By 1910 Cooke was living at Valley Farm, White River (Witrivier) in the Eastern Transvaal (now Mpumalanga) and that year presented a small collection of named butterflies and two rare fishes to the Albany Museum, Grahamstown. More zoological specimens and plants followed in 1911. According to Janse (1940) he also made paintings of moths, and died before 1940.