Hannon received his Ph.D. in Physics from the University of Pennsylvania in 1994, working in the research group of Ward Plummer. In his thesis work he measured the structure and phonon spectra of Be surfaces using electron scattering. Following postdoctoral appointments at the Forschungszentrum Juelich (with Harald Ibach) and Sandia National Labs (with Gary Kellogg), he moved to Carnegie Mellon University as an assistant professor of physics. Major research projects included determining atomic-scale growth mechanisms using STM and low-energy electron microscopy (LEEM). In 2000 Hannon joined IBM's T.J. Watson Research Center, continuing research on surfaces using LEEM. His research activities at IBM are centered on surface phenomena, including strain-driven self-assembly, novel growth mechanisms, nanowire growth, and graphene synthesis. He now manages the Molecular Assemblies and Devices group focused on the synthesis, purfication, and integration of carbon nanotubes and graphene. He is the author of over 50 refereed publications, including articles in Science and Nature. He is active in the American Physical Society, serving on the executive committee of the New York State Section.