Grace Hopper did not write a compiler, nor did Marie Curie discover radium. Marie Curie was the least important and least qualified person on the three man team that discovered radium. No one remembers the second most important person on the team, and few remember the team leader (Pierre Curie, Marie Curie's husband and mentor). Similarly Grace Hopper was peripherally involved in events that eventually led to the development of the first compiler, and no one remembers the people that actually wrote the first compiler (which was, by the way, John Backus' FORTRAN compiler)
Radium was discovered in 1898, and, until the twentieth century, no one thought that Marie Curie was the discoverer. Similarly for compilers. History was rewritten, as it so frequently is.
The language game we are playing is called "name a female computer scientist more influential than Ada Lovelace."
Today is Ada Lovelace Day, when STEM enthusiasts highlight the work of modern and historical women scientists, engineers, and mathematicians. If you run a blog, you may want to participate by posting about a woman in a STEM field whom you admire. But I'd love to have people share women scientists/mathematicians/authors in the comments that they think we could all stand to read more about.