Charles Bryan Dawson (Ph.D.), Jackson, Tennessee, has published his single-variable calculus textbook, Calculus Set Free: Infinitesimals to the Rescue (Oxford University Press). He is professor of mathematics at Union University and a citizen of Cherokee Nation. Charles has been active in mathematics organizations for three decades, previously serving as a regional director and journal editor for Kappa Mu Epsilon and currently serving as Tennessee State Director for the southeast section of the Mathematical Association of America.