Bachelor of Science, Polytechnic College, Amsterdam, The Netherlands, 1953. Master in Civil Engineering, Polytechnic College, Amsterdam, The Netherlands, 1955.
Senior hydraulics engineer, Olarte, Ospina Arias y Payan Ltda, Civil Engineers, Bogotá, Colombia, 1955-1956; soils and materials engineer, Fay Spofford, Boston, 1956-1962; senior project engineer, Dames & Moore, San Francisco, 1962-1976; vice president, Slope Indicator Company, Seattle, 1976-1987; president, E&T Instrumentation, Stoneham, Massachusetts, since 1987; president, W.B.T. Cons., Edmonds, Washington, since 1987.
Member American Society of Civil Engineers (honorary), American Society for Testing and Materials (senior ), International Society Soil Mechanics and Engineering Foundation, Association Engineering Geologists (affiliate).
Married Martha Vanderlaan, October 21, 1958 (divorced 1986). Children: Sonya Maria, John (deceased). Married Mirna Aeschlimann, August 18, 1991.