Ronald C. White Jr. wrote the biography of Abraham Lincoln titled "A. Lincoln: A Biography." The book explores Lincoln's life, character, and leadership style, providing insights into his role during one of the most tumultuous periods in American history—the Civil War. White emphasizes Lincoln's ability to communicate effectively and his commitment to preserving the Union. His book, known for its rich detail and historical accuracy, has contributed significantly to the understanding of Lincoln as a complex figure, highlighting his humanity and moral convictions in the face of profound challenges.