Susan J. Crockford

[4] In 1988, Crockford, along with colleagues Rebecca Wigen and Gay Frederick, founded the contracting company Pacific Identifications Inc. in Victoria.

[6] The company specializes in offering bone and shell analysis of skeletal elements of fish, mammals and birds from western North America and maintains a prominent library of reference animal remains.

Reviewing the book for The University of Chicago Press, Samantha J. Richardson noted that despite offering some "refreshing new" ideas, "no evidence is presented for the existence of these 'thyroid hormones,' " that "there are errors in the descriptions of molecular biology, biochemistry, and endocrinology," that some statements are "simply wrong" and "the references are not always accurate.

[9] In the two-part documentary, she was called upon multiple times to give insight into the process of domestication and the emergence of dogs as a separate species from wolves.

Between at least 2011 and 2013, she received payment from The Heartland Institute, in the form of $750 per month, which Crockford states was to provide summaries of published papers that might not have been covered by the Intergovernmental Panel on Climate Change's Fifth Assessment Report.