Kari Astala (born 26 July 1953 in Helsinki) is a Finnish mathematician, specializing in analysis.
in 1977[1] and received his doctorate there in 1980 with thesis On Measures of compactness and ideal variations in Banach spaces.
[2] In the 1980s and 1990s he held academic appointments at the University of Helsinki and the Academy of Finland.
[1] In 1994 he received the Salem Prize for solving the conjecture of Frederick Gehring and Edgar Reich (1927–2009) in the theory of quasiconformal mappings, applying the theory of dynamical systems.
[3] In 2003 he was involved in the solution of Alberto Calderón's inverse problem, which has application in electrical impedance tomography.