Historical Introduction The Marfan Syndrome: From Clinical Delineation to Mutational Characterization, a Semiautobiographic Account VictorA. McKusick l n 1876, E. Williams, an ophthalmologistin Cincinnati, Ohio, described ectopia lentis in a brother and sister who were exceptionally tall and had been loosejointed from birth. I Although there is a Williams syndrome that has aortic manifestations (supravalvar aortic stenosis), the name Williams was never associated with the disorder we now call Marfan syndrome. The reason is clear: Williamswas geographically removed from the leading medical centers and published in the Transactions of the American Ophthalmological Society; surely his report attracted little attention and the non-ocular features were not emphasized. 2 The case report that brought the disorder to attention was provided by a prominent Pari- sian professor of pediatrics, Antoine Bernard-Jean Marfan (1858-1942), who did much to establish pediatrics as a specialty in France and elsewhere. He was the author of widely read textbooks and monographson pediatrictopics and waseditor of Le Nourrisson for a great many years. In addition to the syndromeunder discussion here, his name is often attached to Marfan’s law (that immunity to pulmonary phthisis is conferred by the healing of a local tuberculous 3 lesion) and Marfan’s subxiphoid approach for aspiratingfluid from the pericardial sac. (Please pardon my use of the possessive form of the eponym in these two instances!) Pictures of Marfan (Fig.