Jan A. Rajchman (1911-1989) was an electrical engineer and pioneer of computer memory systems. He was born in London in 1911, a temporary home for his scientist (bacteriology) father and mother prior to their return to their native Poland when Rajchman was 7 years old. Geneva became home three years later where Rajchman graduated from the College de Geneva in 1930. He was awarded a diploma in electrical engineering and a doctor of science degree from the Swiss Institute of Technology in Zurich in 1934 and 1938.

Rajchman immigrated to the United States in 1935. Following a summer at MIT, RCA hired him to test electronic devices and in 1936 he joined Vladimir K. Zworykin at RCA's facility in Camden, New Jersey. Rajchman was transferred to the newly established RCA Laboratories in Princeton in 1942. During World War II, Rajchman's lab developed a vacuum tube capable of binary arithmetic. In 1946 he assisted in the development of the first RAM high speed memory system, while developing an electrostatic storage tube.

In 1961, Rajchman was appointed Director of RCA Laboratories newly formed Computer Research Laboratory and became Staff Vice President, Data Processing in 1967. His title was changed to Staff Vice President, Information Sciences in 1969. On September 1, 1976, Rajchman retired after more than 40 years with RCA.

Rajchman was awarded 107 US patents for his work with logic circuits for arithmetic, the first ROM memory for computers, and core memory. In addition, his designs for an intricate system of diodes are still the mainstay of present-day multipliers. He was a Fellow of the Institute of Electrical and Electronics Engineers (IEEE), a member of the National Academy of Engineering, and the American Association for the Advancement of Science and the Franklin Institute. He received the 1960 IEEE Liebman Memorial Award and the 1974 IEEE Edison Medal.

Rajchman died in Princeton in 1989, following a long career as a distinguished engineer and computer scientist.