A computer scientist and United States Navy rear admiral, Grace Hopper was a pioneer in the field of programming.
Despite being turned down by the Navy during WWII at age 34 for being too old and underweight, Hopper eventually convinced the Naval Reserve to accept her. There, she was one of the first programmers of the Harvard Mark I computer.
Hopper invented the first compiler for a computer programming language. Her work led to the development of one of the first high-level programming languages, COBOL.