Sergei Tabachnikov

Sergei Tabachnikov, also spelled Serge, (born in 1956) is an American mathematician who works in geometry and dynamical systems.

He earned his Ph.D. from Moscow State University in 1987 under the supervision of Dmitry Fuchs and Anatoly Fomenko.

From 2013 to 2015 Tabachnikov served as Deputy Director of the Institute for Computational and Experimental Research in Mathematics (ICERM) in Providence, Rhode Island.

[5][6][7] A paper on the variability hypothesis by Theodore Hill and Tabachnikov was accepted and retracted by The Mathematical Intelligencer and later The New York Journal of Mathematics (NYJM).

There was some controversy over the mathematical model, the peer-review process, and the lack of an official retraction notice from the NYJM.