H. H. Windsor, or Henry Haven Windsor, was an American publisher and the founder of Popular Mechanics magazine in 1902. His magazine became widely influential for making technical and scientific knowledge accessible to the general public, focusing on do-it-yourself projects, engineering innovations, and new technologies. Windsor's vision was to inspire curiosity and practical skills among everyday readers, bridging the gap between complex science and hands-on applications. Under his leadership, Popular Mechanics grew into a major publication, fostering a generation of inventors, tinkerers, and hobbyists. Windsor's work contributed to the democratization of knowledge in the early 20th century.