Roger O. McClellan, D.V.M., serves as President of the Chemical Industry Institute of Toxicology located in Research Triangle Park, NC, a position he has held since 1988. He is well known for his work in the related fields of toxicology and risk assessment, especially concerning the potential human risks of airborne materials. McClellan has previously served as President of the Society of Toxicology and American Association for Aerosol Research. He is a Fellow of the Society for Risk Analysis and an elected member of the Institute of Medicine. He has served in an advisory role to many public and private organizations including Chairmanship of the U.S. EPA Clean Air Scientific Advisory Committee and the NAS/NRC Committee on Toxicology. McClellan is a strong advocate of the need to integrate data from epidemiological, controlled clinical, laboratory animal and cell studies to assess human health risks of occupational or environmental exposure to chemicals.