Four researchers at the Department of Energy's Oak Ridge National Laboratory have been elected fellows of the American Physical Society (APS), and another three have joined the fellowship of the Institute of Physics. The four APS fellows are David J. Dean, Anthony Mezzacappa and Predrag S. Krstic of ORNL's Physics Division and Lal A. Pinnaduwage of the Life Sciences Division. Election to fellowship in the APS is limited to no more than one half of one percent of the annual APS membership and is in recognition of outstanding contributions to physics. Glenn Young and Witold Nazarewicz of ORNL's Physics Division and Parans Paranthaman of the Chemical Sciences Division have been elected fellows of the Institute of Physics, based in London. The APS recognized Dean for his important contributions to understanding of quantum many-body systems and for applications of computational quantum mechanics to the structure of atomic nuclei. Dean resides in Knoxville with his wife, Brenda, and three children, Nathan, Lydia and Joshua. Mezzacappa was cited by the APS for his pioneering work toward identifying the explosion mechanism of core collapse supernovae and his leadership in the development of U.S. computational science. He resides in Knoxville with his wife, Mary Ellen Johansen, and his three children, Hannah, Noah, and Isabel. The society recognized Krstic for his important and diverse contributions to atomic theory, in particular, to the theory of non-adiabatic heavy-particle collisions and of relativistic effects in ultra-strong laser-atom interaction. Krstic resides in Knoxville with his wife, Vasika. Pinnaduwage was cited for his work in developing microcantilever-based sensors for detection of explosive vapors and elucidation of fundamental physical principles underlying nanodeflagrations