He became a member of the Princeton faculty as an associate professor of physics in 1961. He was elected a Fellow of the American Physical Society in 1964. He was the father of Science writer Michael D. Lemonick
In 1961, he started his career as an associate professor of physics at Princeton University. In 1964, he received recognition from the American Physical Society. Additionally, he had a son named Michael D. Lemonick who writes about science.