Gregory Gregoriadis, Ph.D., is a senior member of staff at the Medical Research Council's Clinical Research Centre, Harrow, Middlesex, England. He received his first degree in Chemistry from the University of Athens and his M.Sc. and Ph.D. in Biochemistry from McGill University. He has carried out research in as diverse fields as the metabolism of trace metals and the interaction of plasma glycoproteins with hepatic receptors. Since 1970 he has worked, published, and lectured extensively on the targeting of drugs via liposomes. Dr. Gregoriadis' interest in drug targeting is reflected in his founding in 1978 the Gordon Research Conference Series on "Drug Carriers in Biology and Medicine" of which he was the first Chairman and in 1981 the NATO Advanced Studies Institute Series "Targeting of Drugs" of which he is the Director. He has also been the editor of Drug Carriers in Biology and Medicine and the senior editor of Liposomes in Biological Systems and Targeting of Drugs.