"Who's Who in America" is a biographical reference work that provides profiles of notable individuals in the United States. It includes information about their careers, achievements, and contributions to society, making it a valuable resource for researchers, historians, and anyone interested in American culture and history. First published in 1899, this directory has evolved over the years to include a diverse range of people from various fields, such as politics, science, arts, and business. It serves as a comprehensive guide to influential figures, helping readers understand the impact of these individuals on American society and history.