Professor John Sumpter is a distinguished professor of the Brunel University, UK. He is an ecotoxicologist, and was amongst the team that first discovered endocrine disruption in fish, and the role of endocrine disrupting chemicals. He also developed the Yeast Estrogen Assay (YES). Wikipedia
The definitive Wikipedia entry for John Sumpter. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/John_Sumpter