Grace Hopper (1906–1992) was a visionary computer scientist and U.S. Navy rear admiral whose work fundamentally shaped modern computing. After earning her PhD in mathematics from Yale in 1934, she joined the Navy during World War II and was assigned to work on the Harvard Mark I computer. Hopper became a pioneer in programming languages, developing the first compiler, which translated written instructions into machine code, and laying the groundwork for COBOL, one of the earliest high-level programming languages still in use today. Known as Amazing Grace she championed the idea that computers should be accessible to non-specialists, helping democratize computing. Her legacy includes not only technical breakthroughs but also her role as a mentor and advocate for women in technology, inspiring generations of computer scientists.