Ian Macintyre is a Research Scientist in the Department of Paleobiology in the National Museum of Natural History. He received his B.Sc. from Queen’s University, Ontario, Canada in 1957 and his Ph.D. from McGill University, Montreal, Canada in 1967. He joined the Smithsonian staff in 1970 after three years of research at the Duke University Marine Laboratory. He is a carbonate petrologist/sedimentologist with a multidiciplinary interest in the post-glacial history of coral reefs, submarine lithification, skeletal mineralogy of reef organisms, bioerosion, and Holocene sea-level history. In 1996 he received the Darwin Medal from the International Society for Reef Studies. Ian was an original member of the scientific team that established Smithsonian’s research activities in Belize in 1972.