Hisham Sati (website) is working on non-perturbative phenomena in string theory/M-theory using tools of cohomology, homotopy theory, algebraic topology and higher category theory. His thesis advisor was Michael Duff.
Hisham Sati is assistant professor in the Mathematics Department at Pittsburgh University.
From his website:
My research is interdisciplinary and lies in the intersection of differential geometry, algebraic topology, and mathematical/theoretical physics. I am mainly interested in geometric and topological structures arising from quantum (topological) field theory, string theory, and M-theory. This includes orientations with respect to generalized cohomology theories, and corresponding description via higher geometric, topological, and categorical notions of bundles.
Hisham Sati, Geometric and topological structures related to M-branes ,
part I, Proc. Symp. Pure Math. 81 (2010), 181-236 (arXiv:1001.5020),
part II: Twisted and structures, J. Australian Math. Soc. 90 (2011), 93-108 (arXiv:1007.5419);
part III: Twisted higher structures, Int. J. Geom. Meth. Mod. Phys. 8 (2011), 1097-1116 (arXiv:1008.1755)
(this is followed up on in remark 5.4.12 in Hopkins, Lurie, Ambidexterity in K(n)-Local Stable Homotopy Theory )
H.S., Urs Schreiber, Mathematical Foundations of Quantum Field and Perturbative String Theory, Proceedings of Symposia in Pure Mathematics, volume 83 AMS (2011)
H. S. , Urs Schreiber, Jim Stasheff, Twisted Differential String and Fivebrane Structures Communications in Mathematical Physics October 2012, Volume 315, Issue 1, pp 169-213 (arXiv:0910.4001)
Domenico Fiorenza, H. S. , Urs Schreiber, A higher stacky perspective on Chern-Simons theory (arXiv:1301.2580) in Damien Calaque et al. (eds.) Mathematical Aspects of Quantum Field Theories Springer 2014
H. S., Framed M-branes, corners, and topological invariants (arXiv:1310.1060)
H. S. , Ninebrane structures (arXiv:1405.7686)
(on ninebrane structures)