John Mauchly
John Mauchly

Celebrity Profile

Name: John Mauchly
Occupation: Computer Scientist
Gender: Male
Birth Day: August 30, 1907
Death Date: Jan 8, 1980 (age 72)
Age: Aged 72
Birth Place: Cincinnati, United States
Zodiac Sign: Virgo

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Weight: in kg - N/A
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John Mauchly

John Mauchly was born on August 30, 1907 in Cincinnati, United States (72 years old). John Mauchly is a Computer Scientist, zodiac sign: Virgo. Find out John Mauchlynet worth 2020, salary 2020 detail bellow.


Taking up an entire room at UPenn, his computer could calculate ballistic firing equations in 30 seconds that took people 20 hours.

Does John Mauchly Dead or Alive?

As per our current Database, John Mauchly died on Jan 8, 1980 (age 72).

Net Worth

Net Worth 2020


Salary 2020

Not known

Before Fame

He and ENIAC co-designer J. Presper Eckert met at the Moore School of Electrical Engineering at the University of Pennsylvania: he did the conceptual design of the computer, and Eckert built the hardware.

Biography Timeline


John W. Mauchly was born on August 30, 1907, to Sebastian and Rachel (Scheidermantel) Mauchly in Cincinnati, Ohio. He moved with his parents and sister, Helen Elizabeth (Betty), at an early age to Chevy Chase, Maryland, when Sebastian Mauchly obtained a position at the Carnegie Institution of Washington as head of its Section of Terrestrial Electricity. As a youth, Mauchly was interested in science, and in particular with electricity, and as a young teenager was known to fix neighbors' electric systems. Mauchly attended E.V. Brown Elementary School in Chevy Chase and McKinley Technical High School in Washington, DC. At McKinley, Mauchly was extremely active in the debate team, was a member of the national honor society, and became editor-in-chief of the school's newspaper, Tech Life. After graduating from high school in 1925, he earned a scholarship to study engineering at Johns Hopkins University. He subsequently transferred to the Physics Department, and without completing his undergraduate degree, instead earned a Ph.D. in physics in 1932.


From 1932 to 1933, Mauchly served as a research assistant at Johns Hopkins University where he concentrated on calculating energy levels of the formaldehyde spectrum. Mauchly's teaching career truly began in 1933 at Ursinus College where he was appointed head of the physics department, where he was, in fact, the only staff member.


In 1941 Mauchly took a course in wartime electronics at the Moore School of Electrical Engineering, part of the University of Pennsylvania. There he met J. Presper Eckert, a recent Moore School graduate. Mauchly accepted a teaching position at the Moore School, which was a center for wartime computing. Eckert encouraged Mauchly to believe that vacuum tubes could be made reliable with proper engineering practices. The critical problem that was consuming the Moore School was ballistics: the calculation of firing tables for the large number of new guns that the U.S. Army was developing for the war effort.


In 1942 Mauchly wrote a memo proposing the building of a general-purpose electronic computer. The proposal, which circulated within the Moore School (but the significance of which was not immediately recognized), emphasized the enormous speed advantage that could be gained by using digital electronics with no moving parts. Lieutenant Herman Goldstine, who was the liaison between the United States Army and Moore School, picked up on the idea and asked Mauchly to write a formal proposal. In April 1943, the Army contracted with the Moore School to build the Electronic Numerical Integrator and Computer (ENIAC). Mauchly led the conceptual design while Eckert led the hardware engineering on ENIAC. A number of other talented engineers contributed to the confidential "Project PX".

John Mauchly has also been credited for being the first one using the verb "to program" in his 1942 paper on electronic computing, although in the context of ENIAC, not in its current meaning.


In the summer of 1941, Mauchly took a Defense Training Course for Electronics at the University of Pennsylvania Moore School of Electrical Engineering. There he met the lab instructor, J. Presper Eckert (1919–1995), with whom he would form a long-standing working partnership. Following the course, Mauchly was hired as an instructor of electrical engineering and in 1943, he was promoted to assistant professor of electrical engineering. Following the outbreak of World War II, the United States Army Ordnance Department contracted the Moore School to build an electronic computer which, as proposed by Mauchly and Eckert, would accelerate the recomputation of artillery firing tables.


The ENIAC design was frozen in 1944 to allow construction. Eckert and Mauchly were already aware of the limitations of the machine and began plans on a second computer, to be called EDVAC. By January 1945 they had procured a contract to build this stored-program computer. Eckert had proposed a mercury delay line memory to store both program and data. Later that year, mathematician John von Neumann learned of the project and joined in some of the engineering discussions. He produced what was understood to be an internal document describing the EDVAC.

Very early in the history of EMCC, John Mauchly assumed responsibility for programming, coding, and applications for the planned computer systems. His early interaction with representatives of the Census Bureau in 1944 and 1945, and discussion with people interested in statistics, weather prediction, and various business problems in 1945 and 1946 focused his attention on the need to provide new users with the software to accomplish their objectives. He knew it would be difficult to sell computers without application materials, and without training in how to use the systems. And so, EMCC began to assemble a staff of mathematicians interested in coding in early 1947. (from Norberg)


In March 1946, just after the ENIAC was announced, the Moore School decided to change their patent policy, in order to gain commercial rights to any future and past computer development there. Eckert and Mauchly decided this was unacceptable; they resigned. However they had already been contracted to do one more thing at the Moore School: to give a series of talks on computer design.


In 1947 Eckert and Mauchly formed the first computer company, the Eckert–Mauchly Computer Corporation (EMCC); Mauchly was president. They secured a contract with the National Bureau of Standards to build an "EDVAC II", later named UNIVAC.


ENIAC could be programmed to perform sequences and loops of addition, subtraction, multiplication, division, square-root, input/output functions, and conditional branches. Programming was initially accomplished with patch cords and switches, and reprogramming took days. It was redesigned in 1948 to allow the use of stored programs with some loss in speed.


Mauchly's interest lay in the application of computers, as well as to their architecture and organization. His experience with programming the ENIAC and its successors led him to create Short Code (see "The UNIVAC SHORT CODE"), the first programming language actually used on a computer (predated by Zuse's conceptual Plankalkul). It was a pseudocode interpreter for mathematical problems proposed in 1949 and ran on the UNIVAC I and II. Mauchly's belief in the importance of languages led him to hire Grace Murray Hopper to develop a compiler for the UNIVAC.


Mauchly stayed involved in computers for the rest of his life. He was a founding member and president of the Association for Computing Machinery (ACM) and also helped found the Society for Industrial and Applied Mathematics (SIAM), serving as its fourth president. The Eckert–Mauchly Corporation was bought by Remington Rand in 1950 and for ten years Mauchly remained as Director of Univac Applications Research. Leaving in 1959 he formed Mauchly Associates, a consulting company that later introduced the critical path method (CPM) for construction scheduling by computer. In 1967 he founded Dynatrend, a computer consulting organization. In 1973 he became a consultant to Sperry Univac.


Mauchly received numerous award and honors. He was a life member of the Franklin Institute, the National Academy of Engineering and the Society for Advancement of Management. He was elected a Fellow of the IRE, a predecessor society of IEEE, in 1957, and was a Fellow of the American Statistical Association. He received an LLD (Hon) degree from the University of Pennsylvania and aDSc(Hon) degree from Ursinus College. He was a recipient of the Philadelphia Award, the Scott Medal, the Goode Medal of AFIPS (American Federation of Information Processing Societies), the Pennsylvania Award, the Emanual R. Piore Award, the Howard N. Potts Medal, and numerous other awards.


In 1959, Mauchly left Sperry Rand and started Mauchly Associates, Inc. One of Mauchly Associates' notable achievements was the development of the Critical Path Method (CPM) which provided for automated construction scheduling. Mauchly also set up a consulting organization, Dynatrend, in 1967 and worked as a consultant to Sperry UNIVAC from 1973 until his death in 1980.


Besides the lack of credit, Eckert and Mauchly suffered additional setbacks due to Goldstine's actions. The ENIAC patent U.S. Patent 3,120,606 , issued in 1964 was filed on June 26, 1947, and granted February 4, 1964, but the public disclosure of design details of EDVAC in the First Draft (which were also common to ENIAC) was later cited as one cause for the 1973 invalidation of the ENIAC patent.


Mauchly and Eckert's patent on the ENIAC was invalidated by U.S. Federal Court decision in October, 1973 for several reasons. Some had to do with the time between publication (the First Draft) and the patent filing date (1947). The federal judge who presided over the case ruled that "the subject matter was derived" from the earlier Atanasoff–Berry Computer (ABC). This statement has become the center of a controversy.


John Mauchly died on January 8, 1980, in Ambler, Pennsylvania, during heart surgery and following a long illness. His first wife, Mary Augusta Walzl, a mathematician, whom he married on December 30, 1930, drowned in 1946. John and Mary Mauchly had two children, James (Jimmy) and Sidney. In 1948, Mauchly married Kathleen Kay McNulty (1921–2006), one of the six original ENIAC programmers; they had five children Sara (Sallie), Kathleen (Kathy), John, Virginia (Gini), and Eva.


In 2002, for his work on ENIAC he was inducted, posthumously, into the National Inventors Hall of Fame.

Family Life

John was born in Cincinnati, Ohio, his father Sebastian a physicist at the Carnegie Institute of Washington, D.C.

🎂 Upcoming Birthday

Currently, John Mauchly is 113 years, 11 months and 6 days old. John Mauchly will celebrate 114th birthday on a Monday 30th of August 2021. Below we countdown to John Mauchly upcoming birthday.


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