Joan Daisey, our beloved former leader and colleague passed away in February 2000. In 1986, Joan came to LNBL from NYU to lead the Chemistry Group. In 1989, she was appointed as the Department head for the IED. Under her leadership, the IED added a new research group on exposure and risk assessment, developed an existing effort into a group on indoor air pollutant transport and expanded the chemistry effort into the PSD&C Group. She served on the Science Advisory Board (SAB) of the U.S. EPA beginning in 1987 and was chair of the SAB executive committee beginning in 1998. She was very active in a number of scientific societies including the International Society of Exposure Analysis, which she helped to found. We miss Joan's friendship, leadership, dedication to science, high energy and uplifting spirit.