He is a professor of nutritional biochemistry at Cornell University in the United States. Thomas is an advocate of a low fat, whole foods, plant based diet. He has authored / co-authored hundreds of research papers on this topic, and in 2005 he released the book ‘The China Study’ which he co-wrote with his son. The China Study has already sold over 1 million copies, which makes it one of the highest selling books on nutrition in the United States.