Bohdan Paczy?ski or Bohdan Paczynski was a Polish astronomer, a scientist in theory of the evolution of stars, accretion discs and gamma ray bursts. Paczy?ski was born February 8, 1940, in Vilnius, Lithuania to a family of a lawyer and a teacher of Polish literature. In 1945 his family chose to leave for Poland and settled in Krak�w, and then in 1949 in Warsaw. At the age of 18, Paczy?ski published his first scientific article in Acta Astronomica. Between 1959 and 1962 he studied astronomy at the University of Warsaw. Two years later he received a doctorate under the tutelage of Stefan Piotrowski and W?odzimierz Zonn. In 1962 Paczy?ski became a member of the Centre of Astronomy of the Polish Academy of Sciences, where he continued to work for nearly 20 years. In 1974 he received habilitation and in 1979 became a professor. Thanks to his works on theoretical astronomy, at the age of 36 he became the youngest member of the Polish Academy of Sciences. In 1981 Paczy?ski visited the United States, where he gave a series of lectures at Caltech to former interns at his Warsaw-based institute. After the introduction of the Martial Law in Poland he decided to stay abroad. 

February 8th, 1940 in Vilnius  /  Died:   Apr 19th, 2007