James Thomas Brenna (born October 15, 1959) is an American scientist specializing in analytical chemistry, mass spectrometry, and in human nutrition and foods, specifically fats.
He testified to the accuracy of Carbon Isotope Ratio (CIR) tests conducted by the French Antidoping laboratory at Châtenay-Malabry.
[2][3] Landis conducted a high profile, multimillion dollar defense but lost the 2007 original hearing[4] with the decision relying for technical opinion on Brenna’s testimony.
[5] Landis later lost a 2008 de novo case before the American Arbitration Association also relying on Brenna’s testimony[6] and was stripped of his title.
[13] In 2016 he was co-lead of a team that discovered an insertion-deletion polymorphism, rs66698963, is under positive selective pressure depending on whether ancestral diets were primarily animal/seafood-based or plant-based.