Joan Hoff is research professor of history at the Montana State University. She has published mainly on US presidents. Hoff has been active as an expert witness in tobacco litigation from 1996 to 2012. She has been very active in Engle Progeny cases in Florida. Hoff has served as an expert witness for the tobacco industry in 31 cases. In a deposition taken in 2012 in New York on Park Avenue relating to Narushka v. R.J. Reynolds, Hoff acknowledged she had made around $325,000 with her tobacco related work.
 Deposition of Joan Hoff, May 24, 2012, Narushka v. R.J. Reynolds. Westlaw reference: 2012 WL 3450343.