Grace Hopper, born in 1906, studied math and physics at Vassar College. She graduated in 1928, and went to Yale University and received a master's degree in mathematics.In 1931, She began teaching at Vassar while simultaneously studying at Yale, where she then earned a Ph.D. in Mathematics in 1934. She was the first few women to have that kind of degree. During her career in the U.S. Naval Reserve, she learned to program a Mark I computer. After later working with Mark II and Mark III computers, she created first compiler for computer languages.
A compiler for computer languages is a compiler that renders worded instruction into code that can be read by computers. This was a prerequisite for COBOL, which would later be used, and is still being used, around the world.