In 1909, Akeley accompanied Theodore Roosevelt on a year-long expedition in Africa funded by the Smithsonian Institution and began working at the American Museum of Natural History in New York City, where his efforts can still be seen in the Akeley Hall of African Mammals. Akeley joined the Explorers Club in 1912, having been sponsored by three of the Club's seven Charter Members: Frank Chapman, Henry Collins Walsh, and Marshall Saville. For qualifying, Akeley wrote only, Explorations in Somaliland and British East Africa. He became the Club's sixth president serving from 1917-1918.In 1921, eager to learn about gorillas to determine if killing them for museum dioramas was justified, Akeley led an expedition to Mt. Mikeno in the Virunga Mountains at the edge of the then Belgian Congo. At that time, gorillas were quite exotic, with very few even in zoos, and collecting such animals for educational museum exhibitions was not uncommon. In the process of collecting several mountain gorillas, Akeley's attitude was fundamentally changed and for the remainder of his life he worked for the establishment of a gorilla preserve in the Virungas. In 1925, greatly influenced by Akeley, King Albert I of Belgium established the Albert National Park, (since renamed Virunga National Park). It was Africa's first national park. Opposed to hunting them for sport or trophies, he remained an advocate of collection for scientific and educational purposes. One of the members of his 1921 expedition was six-year-old Alice Hastings Bradley, who later wrote science fiction under the name James Tiptree, Jr.