Dr. Charles Augustus Leale M.D. (March 26, 1842 – June 13, 1932) was a surgeon in the Union Army during the American Civil War. He was the first doctor to arrive at the presidential box at Ford's Theatre on April 14, 1865 after John Wilkes Booth fatally shot President Abraham Lincoln in the back of the head with a Philadelphia Deringer pistol. There was an interruption in the play when Lincoln arrived. The orchestra played "Hail to the Chief" and the audience gave a standing ovation. Leale could see the full face of the president as he stood only a few aisles behind him.