Yamil H. Kouri, Jr. became interested in postal history in the late 1970s. He has written close to 200 articles and monographs on postal history, primarily dealing with the maritime and military mail of Spain, former Spanish colonies, Cuba, the United States and several European countries. His most recent book is Spanish Colonial and Mexican Mail in the United States (with Leo J. Harris). Kouri is a Fellow of the Royal Philatelic Society London, numbered member of the Real Academia Hispánica de Filatelia e Historia Postal, and member of the European Academy of Philately. He has held leadership positions in the Postal History Society, the American Philatelic Society, American Philatelic Congress, U.S. Philatelic Classics Society, and the Spellman Museum of Stamps & Postal History. He is the former president of the Cuban Philatelic Society and past editor of its journal, The Cuban Philatelist. He is vice-president of the Federación Interamericana de Filatelia (FIAF). He is a U.S. Philatelic Classics Society Distinguished Philatelists and in 2020 he signed the Philatelic Congress of Great Britain's Roll of Distinguished Philatelists. When he is not engaged in philately, sports or family activities, he works as an oncologist and hematologist in the Boston area.