42 COLIN A. MAWSON, prior to his retirement, was head of the envir research branch of Atomic Energy of Canada, Ltd. He specialjzed in trace metal physiology, radioactive waste management, and environmental monitoring. He received his 8.8. in 1929, M.S§ 1930, and Ph.D. (physiology) in 1933 from Manchester Univers (England). He is a member of the National Academy of Sciencds Committee on Radioactive Waste Management. in WILLIAM F. MERPITT, prior to his retirement from the Chalk River of underground radioactivity monitoring of hazardous waste ment areas, including subsurface and surface water and soil. head of the radiochemical analysis laboratory specializing activation analysis for the environmental sampling programs [rain~ fall, snowfall, gas collection). He has a B.S. in chemistryland physics. ?. « FRANK L. PETERSON is in the Department of Geology and yacope the University of Hawaii. He received his B.A. in 1963 from Cor University and his M.S. in 1965 and Ph.D. in 1967 from Stanf University. He specializes in groundwater geology including flow and groundwater stoop in coastal and insular regions; Glyben-Herzberg lens dynamics; occurrence of and exploration [for groundwater; land subsidence; and, a broad range of engineering geology problems. JOHN H. WIGGINS, Jr., a registered civil engineer in the State o fornia, is president of the J. H. Wiggins Company. He recei B.S. in physical sciences in 1953 from Stanford University, M.S. in geophysics in 1955-from St. Louis University, and a §h.D. in civil engineering in 1961 from the University of Illinois specializes in risk and failure analysis and the study of t logical side effects with regard to their impact on the socigl, legal, and economic areas and has written over 25 technical gapers. He currently is a member of the Advisory Board on the Built Environment of the National Academy of Sciences. ALFRED A. YEE, a registered structural engineer, was President: o Alfred A. Yee and Associates and currently is head of AlfredJA. Yee Division of Leo A. Daly Company. He received a B.S. in civil] engineering in 1948 from Rose-Hulman Institute of Technology Jand his M.S. in 1949 from Yale University. He specializes in al! aspects of design and construction, including housing, offic buildings, laboratories, pier and wharf structures, towers, fanks, and theaters; he pioneered the art of composite construction work with prestressed precast concrete units and developed his degign concept involving redistribution of moments and plastic hingds. He was elected to the National Academy of Engineering in 1974.