what were his famous works?
He was interested in the theory of relativity. He wrote the book The Evolution of Physics.
Leopold Infeld
Infeld was interested in the theory of relativity. He was awarded a doctorate at the Jagiellonian University(1921), worked as an assistant and a docent at the University of Lwów(1930–1933) and then as a professor at the University of Toronto between 1939 and 1950. He collaborated with Albert Einstein at Princeton University(1936–1938). The two scientists jointly formulated the equation describing star movements as well as concurrently writing the book The Evolution of Physics.

After the first use of nuclear weapons in 1945, Infeld, like Einstein, became a peace activist. Because of his activities, he was unjustly accused of having communist sympathies. In 1950 he left Canada and returned to communist Poland. He felt he had an obligation to help science in Poland recover from the ravages of the Second World War. He served as President of the Polish Physical Society between 1955 and 1957. In the staunchly anti-communist climate of the time, many in the Canadian government and media fear
who is the scientist after whom einsteinium is named Albert Einstein. when was he born? 14 March 1879. where did he study? Catholic elementary school in Munich, Luitpold Gymnasium in Pavia. has he published any paper related to science? He published "Conclusions from the Capillarity Phenomena", "A New Determination of Molecular Dimensions" also on  photoelectric effect, Brownian motion, special relativity, and the equivalence of mass and energy. did he like music? Yes, He discovered the violin sonatas of Mozart and studied music. did he win any award? Yes, Nobel Prize in Physics, Alfred Nobel to name a few. which of his works earned him this? For his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect. what does the last mentioned  term mean? The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. does it have any application? The effect has found use in electronic devices specialized for light detection and precisely timed electron emission. did he collaborate with any other scientist? Yes,  Leopold Infeld, Nathan Rosen, Peter Bergmann to name a few. who was the first one? He was a Polish physicist.
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Leopold Infeld [SEP] Work
Infeld was interested in the theory of relativity. He was awarded a doctorate at the Jagiellonian University(1921), worked as an assistant and a docent at the University of Lwów(1930–1933) and then as a professor at the University of Toronto between 1939 and 1950. He collaborated with Albert Einstein at Princeton University(1936–1938). The two scientists jointly formulated the equation describing star movements as well as concurrently writing the book The Evolution of Physics. After the first use of nuclear weapons in 1945, Infeld, like Einstein, became a peace activist. Because of his activities, he was unjustly accused of having communist sympathies.