As a child, Eisenstark immigrated to the United States from Poland. After education (including junior college) in Kansas City public schools, he graduated with A.B. and M.A. from the
University of Illinois. His study for a Ph.D. in microbiology was interrupted by
WW II. He became a technical sergeant in the 8th Medical Laboratory of the U.S.
Army Medical Service from 1942 to 1945. His service in the Pacific involved diagnostic procedures for
malaria. He returned to graduate study at the
University of Illinois and became a research assistant in charge of electron microscopy. (Note: The tribute to Eisenstark from the Division of Biological Sciences at the University of Missouri cited the wrong journal for his work on penicillin. This work was published in the
Journal of Bacteriology. The paper that appeared in the journal
Science in 1947 reported electron micrographs of X-ray treated
Escherichia coli.) Eisenstark was a faculty member from 1948 to 1951 at
Oklahoma State University and from 1951 to 1971 at
Kansas State University. His second wife was Joan Ragsdell Eisenstark. Abe Eisenstark died on August 28, 2018. A memorial/ birthday celebration was held later that week on what would have been his 99th birthday at the Unitarian Fellowship in Columbia Missouri. ==Selected publications==