Imre Izsák

In 1965, he traveled to a conference on satellite-geodesics in Paris, where he died of a heart attack in his hotel room on April 21, 1965, at the age of 36. He was buried in Cambridge, Massachusetts, on April 28.

Izsák was married on June 7, 1962, to Emily Kuempel Brady, a teacher of English literature at Boston University. He became a US citizen on February 24, 1964. That fall, his son Andrew was born.

On June 1, 1961, he officially announced his computations of the shape of the Earth and its surface. They brought him to the center of scientific attention and rapidly earned him international fame. He received frequent invitations and gave lectures all over the world. He continued to work hard, agreeing to write a college textbook on the motions of satellites while lecturing at Harvard University. As an acknowledgment his accomplishments, he was made a chief scientist at NASA.

Soon after, he traveled to Switzerland, where the director of the Zürich Observatory offered him a position. He arrived in Zürich on January 9, 1957. By April, he was a full-time researcher at the institute for solar physics. Besides his research, he taught celestial navigation and time measurement to college students. He started learning English and became part of the international scientific community. His results on computing satellite orbits earned him an invitation to Cincinnati, Ohio. Soon he became one of the most respected authorities on the topic. He got a new offer for a position at the Smithsonian Astrophysical Observatory in Cambridge, Massachusetts. This was the primary institute for processing the orbital data of U.S. satellites. The work he started in Cambridge in 1959 led to his greatest successes. He had access to computers, which he needed to carry out much more precise computations than previously. The pace of the work was intense. He and his collaborators published one paper after another and extended their work to the geodesic applications of satellites.

Izsák was interested in the three-body problem and the n-body problem. He studied the light emissions of quasars. After defending his doctorate and ignoring the prevailing wisdom that celestial mechanics was a resolved field, he returned to his favorite topic and started working on the trajectories of rockets and satellites. Putting his work into practice would have been possible only in the Soviet Union or the USA; international connections in Hungary at that time were limited to the occasional conference in the Soviet Union. Therefore, in November 1956, during the Hungarian revolution, he took advantage of the open borders and emigrated to Austria.

In 1953 he joined the Szabadsághegyi Observatory. He later taught at the University of Arts and Sciences in Szeged.

He earned his college degree in mathematics and physics at the Loránd Eötvös University of Arts and Sciences in Budapest. While there, he was a resident of Eötvös College, a residential college for elite students of the university. During his second year he published a paper that resulted in controversy, as some could not believe that such a paper on differential geometry had been written by a young student. Attending lectures by István Földes raised his interest in celestial mechanics. During his college years, he was an assistant at the observatory founded by Miklós Konkoly-Thege. He continued working there after earning his degree in the summer of 1951. In the observatory, he worked under the supervision of László Detre and Júlia Balázs and started working on his advanced degree at the age of 22.

On his return to his native town from a prisoner-of-war camp in the fall of 1945, he enrolled in the 6th grade of Ferenc Deák High School (now Miklós Zrínyi High School). The following year, he simultaneously completed 7th and 8th grade with outstanding results and ranked 1st and 2nd in national mathematics competitions.

Imre Gyula Izsák (Zalaegerszeg, Hungary, February 21, 1929 – Paris, France, April 21, 1965) was a Hungarian mathematician, physicist, astronomer, and celestial mechanician. His father, Gyula Izsák, taught geography and biology in Zalaegerszeg. His mother, Aranka Pálfi, was a mathematics and physics teacher.