John George Nicolay was an American historian and author known for his significant contribution to the biographical and historical literature surrounding President Abraham Lincoln. Born on July 27, 1832, in Germany, Nicolay immigrated to the United States in 1833. He became a close associate of Lincoln, starting as his private secretary and eventually becoming an influential figure in Lincoln's administration. Nicolay, along with his co-author John Hay, produced a comprehensive ten-volume biography of Lincoln, which is often regarded as a foundational work in Lincoln studies. Their writings not only reflect a deep understanding of Lincoln's character and political challenges but also provide valuable insights into the socio-political atmosphere of the time. They aimed to portray Lincoln as a unique leader during a critical period in American history. In addition to the biography, Nicolay wrote extensively on the Civil War and its implications for American society. His work is characterized by thorough research and a commitment to presenting historical events with clarity and accuracy. Nicolay's dedication to Lincoln's legacy has left a lasting impact on historians and scholars, making him a significant figure in American historical writing. John George Nicolay was an influential American historian and author born in Germany in 1832. His close association with President Abraham Lincoln began when he served as Lincoln's private secretary, deeply immersing him in the political landscape of the time. Together with John Hay, Nicolay authored a comprehensive ten-volume biography of Lincoln, cementing their work as a cornerstone in Lincoln studies. Their writings aimed to depict Lincoln’s character and tackle the complexities of his leadership during the Civil War era. Beyond the biography, Nicolay wrote extensively about the Civil War and its impact on American society, characterized by thorough research and clarity. His commitment to preserving Lincoln's legacy has greatly influenced the field of American history.