Lidmaatschap:
Voorzitter (1961-65) International Society for Soil Mechanics and Foundation Engineering North America, en mede-oprichter Sociedad Mexicana de Mecanica de Suelos (1954-68); lid Asociación de Ingenieros y Arquitectos de Mexico, Collegio de Ingenieros Civiles de Mexico, American Concrete Institute, American Society of Civil Engineers, Geological Society of America, Seismological Society of America, Earthquake Engineering Research Institute; buitenl. Lid National Academy of Engineering (VS).