M. Keith Harris is a historian and high school history teacher in Los Angeles, California. He received his BA at the University of California at Los Angeles (summa cum laude) and his Ph.D. at the University of Virginia. He is the author of numerous articles, essays, and books on the American Civil War, the author of the Mastering High School series - a collection of guides for high school history students and teachers, and the creator of Keith Harris History (keithharrishistory.com). He is currently writing a book on Union monuments at Gettysburg.