Anders Lindstedt
Anders Lindstedt was a Swedish mathematician, astronomer, and actuarial scientist, known for the LindstedtPoincar method.
Lindstedt was born in a small village in the district of Sundborns, Dalecarlia a province in central Sweden. He obtained a PhD from the University of Lund agedand was subsequently appointed as a lecturer in astronomy. He later went on to a position at the University of Dorpat where he worked for around seven years on theoretical astronomy. He combined practical astronomy with an interest in theory, developing especially an interest in the three body problem This work was to influence Poincar whose work on the threebody problem led to the discovery that there can be orbits which are nonperiodic, and yet not forever increasing nor approaching a fixed point, the beginning of what we now know as chaos theory.
Source: Wikipedia