Walter J. Crinnion, ND, had been in naturopathic practice since 1982, specializing in treating chronic health problems caused by environmental chemical overload. He was the director of the Environmental Medicine Center at Southwest College of Naturopathic Medicine and associate professor at NCNM and Bastyr University. His book: Clean, Green, and Lean: Get rid of the toxins that make you fat was followed by Clinical Environmental Medicine: Identification and Natural Treatment of Diseases Caused by Common Pollutants, co-authored with Joe Pizzorno, ND and a testament to Dr. Crinnion's profound knowledge of environmental medicine. Sadly, he passed away in March of 2019.
For more on his contributions to botanical medicine, see https://www.botanicalmedicine.org/remembering-walter-crinnion-nd