French botanist. Liogier, or Brother Alain as he was commonly known, studied and collected plants all over the Caribbean and wrote three important floras. Born in France he soon moved to Cuba and studied at the National University in Havana, becoming a Bachelor in Arts and Sciences in 1940 and a Doctor in Natural Sciences in 1945. He has been a professor of botany and biology in a number of universities in the United States, including Manhattan College, New York and in the Dominican Republic. He was an associate investigator at the New York Botanical Gardens, Harvard University and the Smithsonian Institute in Washington, D.C.

In 1972 Dr Liogier founded the National Herbarium of the Dominican Republic (now the National Botanic Gardens). In 1982 he was based at the University of Puerto Rico in Río Piedras, and remained here until he retired in 1995. His retirement, however, did not stop him from continuing his work in the field and he moved to Fort Worth, Texas, where he was a research assistant at the Botanical Research Institute of Texas.

Liogier collected extensively throughout the West Indies and amassed over 45,000 specimens from Cuba alone, 300 of which he described as new to science. With over 100 publications to his name, his most important works are the multi-volume Floras of Puerto Rico, Hispaniola and Cuba. The latter was started by Brother León (another French native) who published the first volume in 1946, but could not continue alone and enlisted Liogier to aid him with the second, who then continued to create the final three volumes after León's death. Several species were named after Liogier, including Eleocharis liogieri T. Koyama, Grammitis liogieri Proctor (= Terpsichore liogieri (Proctor) A.R. Sm.), Miconia alainii Judd & Skean and Scolosanthus liogieri Borhidi. The national park 'Parque Dominicano Alain Henri Liogier' was also named in honour of him.