Lenny works in the area of differential geometry and, in particular, contact geometry and symplectic geometry. His thesis, entitled "Invariants of Legendrian links," develops techniques to distinguish between Legendrian knots and links in standard contact three-space.
Lenny obtained his A.B. summa cum laude in Mathematics and Physics from Harvard University in 1996. His honors' thesis, "Heisenberg model, Bethe ansatz, and random walks," was written under the direction of Persi Diaconis.
As a high school student, Lenny received gold medals in the 1992 and 1993 International Mathematical Olympiads. He was a Putnam Fellow all three years of his undergraduate career 1993 - 1996. He participated in Joe Gallian's REU program at the University of Minnesota, Duluth, in 1994 and 1995.
Lenny has written nine papers on a variety of topics including graph theory, knot theory, and mathematical physics.