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Dr. Weaver made significant contributions to the understanding of protein folding. He was impressed with the research and faculty at the UC Davis Genome Center, where he was planning to spend his sabbatical year 2006-2007. Dr. Weaver focused his early research on high-energy physics, studying photon production and elementary particles. After spending a year and a half as a NATO Fellow at the European Center for Nuclear Research (CERN), in Geneva, Switzerland, he returned to Tufts and began to think about how he could apply his physics background to problems in biology. While he continued to make significant contributions in high-energy physics, for which he received tenure at Tufts in 1969, Dr. Weaver's interests continued to shift towards some of the key unsolved problems in biology. At the University of Rome, Italy, as a visiting CNN Fellow at the Frascati National Laboratory, he became more and more interested in applying his mathematical skills to gain a better understanding of molecular dynamics. He visited Dr. Martin Karplus at Harvard during a sabbatical in 1972, and they began a collaboration that culminated in a paper about a then theoretical diffusion-collision model for protein folding (Nature, 1976). The Diffusion-Collision Model was ahead of its time because the data needed to test it were not available when it was published in 1976. But by the mid-1990s experimental studies had shown that the model did indeed describe the folding mechanism of many proteins. The field has been completely transformed in recent years because of its assumed importance for understanding the large number of protein sequences available from genome projects, says Karplus, and because of the realization that misfolding can lead to a wide range of human diseases. Dr. Weaver received grants from NASA, NATO, Bruker Optics, and the NIH to establish computer facilities at Tufts where he continued to work with students, Dr. Karplus and other collaborators to improve his understanding of important biophysical problems. He was a regular visitor at labs overseas and in the United States, and he authored or co-authored a number of significant scientific publications. He held degrees in Chemistry from Rensselaer Polytechnic Institute and in Physical Chemistry from Iowa State University. A Fellow of the American Physical Society, Dr Weaver also served as the chair of the Tufts Department of Physics and Astronomy from 1989 to 2002. He was born in Albany, NY, on April 18, 1937. David Weaver possessed an easy manner, a sense of fairness, curiosity and an enjoyment of life that was evident in his teaching and relations with colleagues. All who knew him will miss his kind and cheerful humor, his smile and his generous spirit. CURRICULUM VITAE David L. Weaver, Professor of Physics Molecular Modeling Laboratory and Department of Physics and Astronomy Tufts University Date of Birth April 18, 1937, U.S.A. Education Rensselaer Polytechnic Institute, B.S. in Chemistry, 1958 Iowa State University, Ph.D. in Physics and Chemistry, 1963 Positions Held Research Associate, Iowa State University, 1963–64 Visiting Scientist, CERN, Geneva, Switzerland,1965–66 Research Assoc., University of Rome and CNEN Fellow, Frascati National Laboratory, 1968-69 Visiting Scientist, Chemistry Department, Harvard University, Spring Term 1972 Consultant, Laboratory of Chemical Biology, NIAMD, NIH, Bethesda, Maryland, Summer 1974 National Research Council NASA Senior Research Associate, Ames Research Center, 1981-82 Hon. Research Fellow, Laboratory of Molecular Biophysics, Department of Crystallography, Birkbeck College, London 1985-86 Visiting Scientist, Imperial Cancer Research Fund Laboratories, 1992,1993,1999. Visiting Scientist, Imperial College of Science and Technology, London 2002 Assistant Professor, Tufts University 1964-69 Associate Professor, 1969–77 Professor 1977- Chair, Department of Physics and Astronomy 1989-2002 Fellowships and Grants Atomic Energy Commission Postdoctoral Fellow, Iowa State U., 1964 Brandeis Summer Institute in Theoretical Physics Fellow, July 1964 NATO Postdoctoral Fellow in Science, CERN, Geneva, Switz., 1965-66 CNEN Fellow, Frascati National Laboratory, Frascati, Italy, 1968-69 Research Fellow, University of Rome, Italy, 1968–69 Faculty Associate, Atomic Energy Commission Grant, 1964–71 Principal Investigator, NSF Grant in Theoretical Physics, 1972–74 Principal Investigator, NSF Grant in Molecular Biophysics, 1978–81 Biomedical Research Grant, Tufts University, 1980–81, 81-82, 82,83, 86-87, 88-89, 89-90 National Research Council, NASA Senior Research Associateship, 1981–82 Principal Investigator, NASA Grant in Molecular Biophysics, 1982–84 Principal Investigator, NATO Grant in Molecular Biophysics, 1987-88 Principal Investigator, NIH Grant in Molecular Biophysics, 1984-92 Principal Investigator, EPA Grant in Environmental Physics, 1992-94 Spectraspin Corporation Research Grant 1993-2003 Honorary Societies and Organizations Sigma Xi Phi Lambda Upsilon American Physical Society (Fellow) Biophysical Society Molecular Graphics Society Protein Society RECENT PUBLICATIONS Approximately 80 refereed publications including the following recent ones: Yapa, K.K., Weaver, D.L. and Karplus, M., β-Sheet-Coil Transitions in a Simple Polypeptide Model, Proteins, 12, 237-265 (1992). Yapa, K.K. and Weaver, D.L., Folding kinetics of designer proteins: Application of the diffusion- collision model to a de novo designed four-helix bundle, Biophys. J. 63, 296-299 (1992). Schneller, W. and Weaver, D.L., Simulation of α -Helix-Coil Transitions in Simplified Polyvaline: Equilibrium Properties and Brownian Dynamics, Biopolymers 33, 1519-1535 (1993). Karplus, M. and Weaver, D.L., Protein Folding Dynamics: The Diffusion-Collision Model and Experimental Data, Protein Science, 3, 650-668 (1994). Fezoui, Y., Weaver, D.L. and Osterhout, J., De Novo Design and Structural Characterization of an α-Helical Hairpin Peptide, Proc. Natl. Acad. Sci. USA, 91 3675-3679 (1994). Weaver, T.D., Islam, S.A. and Weaver, D.L., MacMolecular: A program for visualization of mo- lecular structures on the Macintosh, Journal of Molecular Graphics, 12, 231-234 (1994). Schneller, W., Gunther, L. and Weaver, D.L., Thermally activated escape over time-modulated fluctuating barriers, Physical Review E, 50: 770-773 (1994). Fezoui, Y., Weaver, D.L. and Osterhout, J.J., Strategies and rationales for the de novo design of a helical hairpin peptide, Protein Science, 4, 286-295 (1995). Pappu, R.V., Schneller, W.J. and Weaver, D.L., Electrostatic Multipole Representation of a Polypeptide Chain: An Algorithm for the Simulation of Polypeptide Properties, Journal of Com- putational Chemistry, 17, 1033-1055 (1996). Yapa, K.K. and Weaver, D.L., Protein Folding Dynamics: Application of the Diffusion-Collision Model to the Folding of a 4-Helix Bundle, Journal of Physical Chemistry, 100, 2498-2509 (1996). Pappu, RV and Weaver, DL, The early folding kinetics of apomyoglobin, Protein Science, 7: 1-11 (1998). Weaver, D.L., Connection between back-reaction boundary conditions and approach to equilibri- um for double square wells, Journal of Chemical Physics, 100, 6032-6038 (1999). Jun, B and Weaver, DL, Diffusion-controlled kinetics of the helix-coil transition with square bar- rier hydrogen bonds, Journal of Physical Chemistry, 112, 4394-4401 (2000). Vasilkowski, Z and Weaver, DL, A generator of protein folding kinetics states for the diffusion- collision model, Journal of Computational Chemistry, 21, 923-932 (2000). Beck, C, Siemens X and Weaver, DL, Diffusion-collision model study of misfolding in a four-he- lix bundle protein, Biophysical Journal 81, 3105-3115 (2001). Jun, B and Weaver, DL, One-dimensional potential barrier model of protein folding with interme- diates, Journal of Chemical Physics 116: 418-426 (2002). Islam, S, Karplus, M and Weaver, DL, Application of the diffusion-collision model to the folding of three-helix bundle proteins, Journal of Molecular Biology 318: 199-215 (2002).