Carnegie Mellon University

Gregory Rohrer

Gregory Rohrer

W.W. Mullins Professor of Materials Science and Engineering
Head of the Department of Materials Science and Engineering

  • 3327 Wean Hall
5000 Forbes Avenue
Pittsburgh, PA 15213


Gregory S. Rohrer is the W.W. Mullins Professor of Materials Science and Engineering and the head of the Department of Materials Science and Engineering at Carnegie Mellon University. He received his bachelor's degree in Physics from Franklin and Marshall College in 1984 and his Ph.D. in Materials Science and Engineering from the University of Pennsylvania in 1989. Rohrer is an associate editor of the Journal of the American Ceramic Society, was chair of the Basic Science Division of the American Ceramic Society in 2005, and was chair of the University Materials Council in 2011. He has authored more than 230 publications and received a number of awards recognizing his research. From the American Ceramic Society, he has received the Roland B. Snow Award (1998), the Ross Coffin Purdy Award (2002), the Richard M. Fulrath Award (2004), the Robert B. Sosman Award (2009), and the W. David Kingery Award (2014).


  • 1989: Ph.D., Materials Science and Engineering, University of Pennsylvania
  • 1984: BS, Physics, Franklin and Marshall College


The properties of surfaces and grain boundaries are influenced by their geometric and crystallographic structure, their stoichiometry, and their defect structure. Professor Rohrer’s research is aimed at the quantitative study of interfacial properties with the goal of defining structure-property relationships for interfaces. Current research in the area of polycrystalline structure has the goals of quantifying the population of different grain boundary types, measuring their properties, understanding the mechanism by which the network forms during processing, and understanding the influence that the network structure has on the macroscopic properties of the material. Current research in the area of metal oxide surfaces has the long range goal of developing composite polar oxide materials that make the photolytic production of hydrogen economically feasible.


M.Y. Zhang, P.A. Salvador, G.S. Rohrer, "Influence of pH and surface orientation on the photochemical reactivity of SrTiO3" ACS Applied Materials and Interfaces, 12 (2020) 23617-23626.

W. Song, E.M. Lopato, S. Bernhard, P.A. Salvador, G.S. Rohrer, "High-throughput measurement of the influence of pH on hydrogen production from BaTiO3/TiO2 core/shell photocatalysts," Applied Catalysis B: Environmental, 269 (2020) 118750.

F. Ram, J.T. Lloyd, and G.S. Rohrer, "Habit planes of twins in a deformed Mg alloy determined from three-dimensional microstructure analysis," Materials Characterization, 102 (2020) 110014.

A.S. Pisat, P.A. Salvador, and G.S. Rohrer, "The Facet Structure and Photochemical Reactivity of Arbitrarily Oriented Strontium Titanate Surfaces," Advanced Materials Interfaces, 6 (2019) 1900731.

X. Zhong, M.N. Kelly, H.M. Miller, S.J. Dillon, G.S. Rohrer, "Grain Boundary Curvatures in Polycrystalline SrTiO3: Dependence on Grain Size, Topology, and Crystallography," Journal of the American Ceramic Society, 102 (2019) 7003-7014.

A. Bhattacharya, Y.-F. Shen, C.M. Hefferan, S.F. Li, J. Lind, R.M. Suter, G.S. Rohrer, "Three-dimensional observations of grain volume changes during annealing of polycrystalline Ni," Acta Materialia, 167 (2019) 40-50