Dr. Aaron Marcus has been a mentor and pioneering scientist in hemostasis, coagulation, thrombosis, and vascular biology for 52 years. He isolated and characterized every lipid of human platelets. He also demonstrated the coagulation-promoting properties of isolated human platelet function by acetyl salicylic acid. His studies of the role of eicosanoids in hemostasis and thrombosis led to the concepts of cell-cell interactions and transcellular metabolism. Dr. Marcus and his colleagues initially discovered AIDS in the form of Kaposi's sarcoma. Among his landmark publications are "The Physiology of Blood Platelets" with Dr. Marjorie Zucker and his historic review "Platelet Function" in three consecutive issues of the New England Journal of Medicine.