John Quincy Adams: American Visionary

This Republic of Suffering: Death and the American Civil War (National Book Award Finalist)

Lincoln: The Biography of a Writer

Narrative of the Life of Frederick Douglass: An American Slave

His Masterly Pen: A Biography of Jefferson the Writer

Personal Memoirs of Ulysses S. Grant: Volumes One and Two

Thomas Carlyle: A Biography

Truman

Dickens: A Biography

Team of Rivals: The Political Genius of Abraham Lincoln

Henry James: The Imagination of Genius, A Biography

Twelve Years a Slave

Gore Vidal

John Adams

Crazy Horse and Custer: The Parallel Lives of Two American Warriors

The Rise of Theodore Roosevelt

The Flags of the Confederacy

Killing Lincoln: The Shocking Assassination that Changed America Forever

The Demon of Unrest: A Saga of Hubris, Heartbreak, and Heroism at the Dawn of the Civil War