J.A.T. Walters, agriculturalist and botanist, qualified as Bachelor of Arts (BA). He was appointed in the Department of Agriculture of the Transvaal Colony before or in 1909, because he reported on "Maize variety tests at Skinners Court, season 1909-10" in the Transvaal Agricultural Journal (1910). After the formation of the Union of South Africa in 1910 his post was that of assistant botanist in the Department of Agriculture. In 1911 he contributed five articles to the Agricultural Journal of the Union of South Africa: "Winter pasture grasses in the Standerton district", "Weights of grain and seeds at the Johannesburg show, April, 1911", "Millets", "The laying down of permanent pastures", and "Notes on some wheat-breeding experiments at the Botanical Experiment Station, Pretoria".
In 1912 Walters was transferred to the Department of Agriculture of Southern Rhodesia (now Zimbabwe) as assistant agriculturalist and botanist (under H.G. Mundy*) and stationed in Salisbury (now Harare). During 1913 and 1914 he published several articles on various crops in the department's Agricultural Journal. He was a member of the South African Association for the Advancement of Science by 1910, but his membership lapsed after he moved to Zimbabwe. There he became a member of the Rhodesia Scientific Association. In 1917 he was a member also of the Royal Society of South Africa.