Viktor Vasilyev

Victor Anatolyevich Vassiliev or Vasilyev (born April 10, 1956), is a Soviet and Russian mathematician. He is best known for his discovery of the Vassiliev invariants in knot theory, which subsume many previously discovered polynomial knot invariants such as the Jones polynomial. He also works on singularity theory, topology, computational complexity theory, integral geometry, symplectic geometry, partial differential equations, complex analysis, combinatorics, and Picard–Lefschetz theory.