Together with M.B. Green, I developed the boundary state description of Dirichlet branes in the light cone gauge

Together with M.B. Green, I constructed D-instantons in type IIB superstring theory, found instanton induced terms in the effective action like R^4 and determined the exact form of these terms using S-duality

Together with M.Costa and A. Strominger, I  found new supergravity solutions which generalize the Melvin solution of Einstein-Maxwell theory and give interpolations between supersymmetric and nonsupersymmetric solutions.

Together with A. Strominger, I  found new time dependend solutions describing the creation and decay of branes.

Together with D. Bak and S. Hirano I found a dilatonic domain wall solution in AdS_5 x S^5 which corresponds to an interface solution in N=4 SYM where the coupling constant jumps across the interface

Together with E. D'Hoker, J. Estes, D. Krym and M. Chiodaroli, I found new solutions in type IIB string theory and M-theory. These solutions preserve up to half the original supersymmetry and are dual to interfaces and and defects such as Wilson lines and surfaces  in  CFT's.

Together with P. Kraus, E. Perlmutter and M. Ammon constructed black hole solutions in three dimensional higher spin theories which are described by Chern-Simons theories in the bulk.

Together with A. Karch, E. D'Hoker and Christoph Uhlemann we found new AdS_6 solutions in type IIB supergravity which are dual to 5dim SCFTs constructed from (p,q) 5-brane webs