Henri Alain Liogier, also known as Brother Alain (January 31, 1916 – November 9, 2009) was a French botanist, educator, and member of the clergy based out of Texas, United States. Liogier is responsible for over 100 scientific journal articles and over 30 books devoted to the study of botany. He published the quintessential work on the flora of Cuba, Hispaniola and Puerto Rico, and these works are the foundation of botanical science for the Caribbean. During his life's work, he discovered over 300 species of plants all of which can be found at the New York Botanical Garden where he also served as a research associate. He was a founding member of the Academy of Science and first scientific director of the National Botanical Garden in the Dominican Republic. Dr. Liogier was recipient of the John Simon Guggenheim Fellowship for Studies in Plant Science. He was also the director of the Botanic Garden at the University of Puerto Rico.