He is a distinguished scientist and former head (2010–2015) of the Theoretical Physics Department at the Fermi National Accelerator Laboratory Batavia, Illinois.

He obtained a Fulbright Travel Grant and was awarded a Frank Knox Memorial Fellowship to attend graduate school at Harvard University.

[2] He became an APS fellow in 1996 and in 2018 he was awarded a Doctorate of Science from the University of Auckland for his work on "Amplitudes in Gauge Theories".

With collaborator Gregory Mahon and others he pioneered the study of spin correlations in Top Quark pair production at Hadron collider which has lead to the confirmation of quantum entanglement at the highest possible energy by ATLAS and CMS.

[5] He gave the first analytical solution to the MSW effect including the non-adabatic region and has made important contributions to the physics of Long baseline Neutrino Oscillation experiments, T2K, NOvA, Hyper-Kamiokande and DUNE as well as the reactor experiments RENO, Daya Bay and JUNO.