The International Society of Exposure Science (ISES), is a non-profit organization established in 1990 by a group of scientists and engineers, including Paul Lioy. The formation of this society was at least partially in response to a National Research Committee (NRC) on Exposure Assessment that held a series of meetings and workshops beginning in 1987 that formed the foundation of exposure science and defined basic principles. The expertise of members in ISES is interdisciplinary and draws upon a broad array of disciplines, including: exposure assessment; biochemistry; risk assessment; bioinformatics; physiology; toxicology; epidemiology; ecology; environmental chemistry; and environmental engineering. The Society’s membership is professionally diverse and includes academic, governmental, and private sector scientists, as well as policy makers who have a common interest in exposure science. ISES has operated with a President, President-elect, Treasurer, and Secretary as well as Councilors. Councilors are elected from the membership and are allocated from the various professional categories that represent Society membership. The first set of Bylaws was approved by the membership in 1991.