Terry Stevenson, originally from England, has made Kenya his home since 1977. As the resident ornithologist at Lake Baringo from 1981 to 1985, he wrote The Birds of Lake Baringo, an annotated checklist recording a total of 458 species in the area.

He is the senior author of the Field Guide to the Birds of East Africa: Kenya, Tanzania, Uganda, Rwanda, Burundi--the only guide in the region to have a text and maps, opposite plates format. He is also co-author to Birds of the Horn of Africa: Ethiopia, Eritrea, Djibouti, Somalia and Socotra. Published in 2009, this acclaimed guide is the only one to this region. He is a member/advisor to the Bird Committee of Nature Kenya and the East African Rarities Committee. On November 30, 1986, he set a new World Big Day record with 342 species in one day in Kenya; the record stands today.

One of Africa's and India's foremost bird-tour guides, Terry has led numerous Field Guides tours across the African continent, in Madagascar, and in India. He is currently living in a mud-and-cow-dung mansion near Mt. Kenya.