Simon Winchester, "The Men Who United the States: America's Explorers, Inventors, Eccentrics, and Mavericks, and the Creation of One Nation, Indivisible." 7 p.m. Sept. 30. Signing. Free. Decatur Library Auditorium, 215 Sycamore St., Decatur. 404-370-8450, Ext. 2225; georgiacenterforthebook.org. The best-selling author of "Atlantic" has written a popular history of those who worked to discover, connect and bond the people and the geography of the United States.
S.C. Gwynne, "Rebel Yell: The Violence, Passion and Redemption of Stonewall Jackson." 8 p.m. Sept. 30. Lecture, signing. $10. Atlanta History Center, 130 W. Paces Ferry Road N.W., Atlanta. 404-814-4150, atlantahistorycenter.com/program/livingston-lecture-sc-gwynne-rebel-yell-violence-passion-and-redemption-stonewall-jackson. Before Jackson revolutionized the art of war, he was an eccentric physics professor at a military college, with bad eyesight and a host of physical problems. Gwynne ("Empire of the Summer Moon") details the transformation.