John Grierson was a Scottish filmmaker and a pioneer of the documentary film movement. Born on April 26, 1898, he is often credited with coining the term "documentary" to describe non-fiction films that aim to document reality. Grierson believed in the power of film as a tool for social change and education, influencing many filmmakers and the development of the genre. Throughout his career, Grierson produced and directed several influential documentaries, including Night Mail and Drifters. He also played a significant role in establishing the National Film Board of Canada, where he served as the first commissioner. His work laid the foundation for modern documentary filmmaking.