According to Wikipedia,
Dr. Kenneth Olden is a scientist whose research revolves around diseases, such as cancers, and how chemicals and environmental factors affect them. He was director of the National Institute of Environmental Health Sciences and National Toxicology Program, being the first African-American to head an NIH institute, a position he held from 1991 to 2005. He was also the director of the Environmental Protection Agency and overseer of the Integrated Risk Information System . He is a scientist who expressed that socioeconomic factors are related to cancer survival rates and need to be given more attention in scientific research. He has made multiple discoveries in the field, such as finding that the sweetener saccharin is not a chemical that causes cancer and funding research on the effects of bus exhaust on minority children in low-income housing residing in New York City. He faced controversy from multiple organizations over slow assessments during his time overseeing IRIS. He is currently 81 years old.