Following his graduation, he joined Texas A&M University where he wrote a research paper titled Quantum Coherence and Interference in Optics and Laser Spectroscopy that he used for his Ph.D. thesis.
Between this and 1994 he was a visiting scientist to Max Planck Institute of Quantum Optics in Garching, Germany.
Later on he became a postdoc at Texas A&M University and then became a fellow, and later joint director, of the Institute for Theoretical Atomic and Molecular Physics a division of Center for Astrophysics | Harvard & Smithsonian.
[2] In 2005 he proposed an idea to use quantum computing mail rather than Email which is already used by both Harvard and Boston Universities.
[3] He and Vladan Vuletic[4] experimentally confirmed a new type of matter in which photonic molecules can be used to create a lightsaber-like technology.