In 2014 he was an invited speaker at the International Congress of Mathematicians in Seoul and gave a talk called "The Surface Subgroup and the Ehrenpreis Conjectures". with Vladimir Markovic: "Immersing almost geodesic surfaces in a closed hyperbolic three manifold".
2014 war er Eingeladener Sprecher auf dem ICM in Seoul (The surface subgroup and the Ehrenpreis Conjectures). mit V. Markovic: Immersing almost geodesic surfaces in a closed hyperbolic three manifold.