Wayne R. Ott, Ph.D., is Adjunct Professor at the Department of Civil and Environmental Engineering, Stanford University. For 30 years, he worked for the U.S. Environmental Protection Agency as a research scientist, developing and applying new techniques for measuring human exposure to air pollutants. In 1996, he joined Stanford University, where he continued his research on developing techniques for measuring and predicting human exposure to air pollution from a variety of sources: factories, motor vehicles, wildfires, woodsmoke, cooking, candles, incense, cigarettes, water pipes, and cigars. He has conducted large-scale measurement field surveys of secondhand tobacco smoke in taverns, restaurants, casinos, homes, and automobiles, publishing more than 125 journal articles and scientific papers. In 1995, he received the Jerome J. Wesolowski Award in recognition for “outstanding contributions to the knowledge and practice of human exposure assessment.” He is co-editor of the science textbook, Exposure Analysis, and a founding member of the International Society of Exposure Science (ISES). Recently, his research has focused on accurately measuring human exposure to secondhand marijuana smoke.