Marlyn Meltzer

Marlyn Meltzer was an American mathematician and computer programmer, renowned as one of the original six programmers of the groundbreaking ENIAC, the first general-purpose electronic digital computer. Hired by the United States Army during World War II to perform ballistics calculations, she and her colleagues transitioned from human "computers" to pioneering the field of software programming without manuals or formal training. Her work was instrumental in demonstrating the practical utility of electronic computation, influencing subsequent developments in computer science and technology.

Early life and education

Born Marlyn Wescoff in 1922 in Philadelphia, she grew up during the Great Depression and attended local public schools. She pursued higher education at Temple University, where she earned a Bachelor of Science degree in mathematics, a field that was becoming increasingly vital for wartime efforts. Following her graduation, she sought employment that utilized her analytical skills, leading to a position as a "computer" at the Moore School of Electrical Engineering at the University of Pennsylvania. This role involved performing complex trajectory calculations for artillery firing tables, tedious work that was critical to the United States Army Ordnance Corps and its research at the Aberdeen Proving Ground.

Career at the University of Pennsylvania

Meltzer was employed by the University of Pennsylvania's Moore School of Electrical Engineering, which held a crucial contract with the United States Department of War. She worked under the supervision of John Mauchly and J. Presper Eckert, the principal engineers of the secret ENIAC project. Her initial duties, shared with a team of women including Kathleen Antonelli, Jean Bartik, Betty Holberton, Frances Spence, and Ruth Teitelbaum, involved solving differential equations for ballistics trajectories using mechanical desk calculators and IBM punch-card machines. This group was selected from over a hundred human computers for their exceptional skill and reliability, forming the core team that would later program the ENIAC.

ENIAC programming and contributions

When the physical construction of the ENIAC was completed in 1945, Meltzer and her five colleagues were tasked with making the machine perform useful calculations, effectively becoming the world's first modern programmers. Without programming languages or debugging tools, they learned the machine's operation through logical diagrams and physical configuration, manually setting thousands of switches and cables to route data and instructions. Meltzer specifically worked on the ENIAC's function table, a read-only memory device, and contributed to programming calculations for problems such as ballistics, wind tunnel design, and early atomic bomb simulations. Their successful demonstration for the public and military officials in February 1946 at the University of Pennsylvania proved the viability of programmable electronic computation.

Later career and legacy

After World War II, Meltzer left the University of Pennsylvania and worked for the United States Army at the Aberdeen Proving Ground and later at the David Taylor Model Basin, applying her computing expertise to naval architecture and hydrodynamics. Though she stepped away from the forefront of the burgeoning computer industry, her pioneering role was largely unrecognized for decades. Historical reevaluation, notably through research by Kathy Kleiman and the ENIAC Programmers Project, led to her posthumous induction into the Women in Technology International Hall of Fame in 1997. Her legacy is celebrated as a foundational figure in software engineering, highlighting the critical yet often overlooked contributions of women in the early history of computer programming.

Personal life

Marlyn Wescoff married Harold Meltzer, a businessman, and together they had two children. She lived for many years in Yardley, Pennsylvania, maintaining a private life after her career in computing. An avid bridge player, she was also actively involved in her local community and synagogue. She passed away on December 7, 2008, in Yardley, Pennsylvania, survived by her family. Her personal papers and recollections have contributed to historical accounts of the ENIAC and the origins of the Information Age.

Category:American computer programmers Category:ENIAC programmers Category:2008 deaths Category:1922 births Category:People from Philadelphia Category:Temple University alumni