Grace Hopper
Grace Hopper was an American computer scientist and U.S. Navy rear admiral whose pioneering work on programming languages, including developing the first compiler, helped shape the foundations of modern computer science.
Frustrated that programming required speaking machine code directly, Hopper built the first tool that let people write instructions in something closer to plain English instead.
From the Navy to the Mark I
Hopper joined the U.S. Navy Reserve during World War II and was subsequently assigned to work on the Harvard Mark I computer, one of the earliest large-scale automatic calculating machines, marking the beginning of her long and influential career in computing.
Inventing the Compiler
In 1952, Hopper developed the first compiler, a groundbreaking program capable of translating written human-readable instructions into machine-readable code, a breakthrough that made computer programming dramatically more accessible.
A Foundational Influence on COBOL
Hopper's compiler work directly influenced the development of COBOL, one of the earliest widely used programming languages designed specifically for business applications, which remained in significant commercial use for decades afterward.
Popularizing "Debugging"
Hopper is often credited with popularizing the computing term "debugging," after her team famously removed an actual moth found trapped in the Mark II computer's relay in 1947, taping the offending insect into their logbook.
A Trailblazing Career
Hopper continued advocating for accessible programming languages throughout her career, eventually achieving the rank of rear admiral in the U.S. Navy before her death in 1992, and remains celebrated as a pioneering trailblazer for women in computer science.
