Rear Admiral Grace Murray Hopper's career in computer science began in the 1940s. Her work with early computers, including the Harvard Mark I, led to ground-breaking and fundamental advances in computer science. Here, Hopper discusses her work with Howard Aiken and the Mark-I computer in a 1983 lecture at the Boston Computer Museum. Image: Photo by Carolyn Sweeny. Collection of the Computer History Museum, 102630706.