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George Richard Isaak (7 March 1933 – 5 June 2005) was aPolish Australianphysicist, an important figure in the development ofhelio- andasteroseismology.
Isaak was born in Poland on 7 March 1933. His family moved to Germany after the Second World War and to Australia in 1950. Isaak studied at theUniversity of Melbourne, achieving his Bachelor of Science (BSc) in 1955 and Master of Science (MSc) in 1958. A spell in industry followed, in which Isaak worked for ICI in Australia 1959-1960 during which time he patented a spectrophotometer for very high-resolution optical spectroscopy, using the resonant scattering of light by atoms.In 1961 Isaak returned to science at theUniversity of Birmingham from whom he received his PhD in 1966, and where he stayed until his retirement in 1996, at this time taking up an Adjunct Faculty position at the University of Minnesota. Isaak remained active in scientific endeavors until the time of his death. Isaak married once to Umit, a fellow physicist at Birmingham in 1964.
Isaak's work in resonant-scattering spectroscopy observations of the Sun directly led to the first detection (1979) of the Solar five-minute oscillations as a global phenomenon, directly leading to the science ofHelioseismology - the study of the solar interior by analysis of the properties of these oscillations. Isaak led the High Resolution Optical Spectroscopy (HiROS) Group at the University of Birmingham, establishing the six-site globalBiSON network for helioseismic observations. In many ways ahead of his time, Isaak also devoted efforts to observation of these 'solar like' observations in other stars, a science now known asAsteroseismology.
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