Vladimir Gershonovich Drinfel'd (Владимир Гершонович Дринфельд) is a mathematician born February 4, 1954 in Ukraine.
He also generalized Hopf algebras to quasi-Hopf algebras, and introduced the study of Drinfeld twists, which can be used to factorize the R-matrix corresponding to the solution of the Yang-Baxter equation associated with a quasitriangular Hopf algebra.