First Sacks Prize from the Association for Symbolic Logic (ASL) (1993); Sloan Foundation Fellowship 1998; An invitation to the International Congress of Mathematicians (1998); The Karp Prize of the ASL (2003); Invited key speaker to the Alfred Tarski Lectures at UC Berkeley
Hjorth earned his PhD in 1993, under the direction of W. Hugh Woodin, with a dissertation entitled On the influence of second uniform indiscernible. He held faculty positions at the University of California, Los Angeles and the University of Melbourne. University Of Melbourne has Greg Hjorth Memorial Prize (biennial scholarship is awarded to the most outstanding postgraduate thesis in mathematics, with preference given to areas of logic, set theory, measure theory or related topics passed by examiners within the previous two calendar years) named after him.[8] Among his most important contributions to set theory was the so-called theory of turbulence, used in the theory of Borel equivalence relations.[9][10] In 1998, he was an Invited Speaker of the International Congress of Mathematicians in Berlin.[11]
Death
Hjorth died suddenly of a heart attack in Melbourne, on 13 January 2011.
Book
G. Hjorth: Classification and Orbit Equivalence Relations, Mathematical Surveys and Monographs, 75, American Mathematical Society, Providence, Rhode Island, 2000.