Through Five Administrations: A Unique Firsthand Chronicle from Inside the White House Colonel William H. Crook (1839-1915) was an American soldier, lawman, and longtime presidential bodyguard who served as a member of the White House staff under five U.S. presidents. A Union Army veteran of the Civil War, Crook was appointed to President Abraham Lincoln's security detail in 1864 and remained in government service for over four decades. Known for his loyalty, discretion, and close proximity to power, Crook witnessed key moments in American history, from the final days of the Civil War through the turn of the 20th century. His unique role allowed him to observe presidents and their families in both public and private settings, making him an invaluable chronicler of White House life. Through Five Administrations, published in 1910, offers an intimate, behind-the-scenes account of the American presidency as experienced by a man who stood just steps from history. With warmth and candor, Crook reflects on the personalities, habits, and leadership styles of Presidents Lincoln, Johnson, Grant, Hayes, and Garfield, revealing lesser-known stories and humanizing moments often absent from official records. His vivid recollections provide both personal insight and valuable historical perspective, making the book a rare window into the evolving role of the presidency and life inside the Executive Mansion during a pivotal era in American history.