ABOUT SIMONSEN LABORATORIES, INC. Simonsen Laboratories supplies animals, diets and related services for research and education. Founded in 1946 the family-owned and operated business has evolved into over 100,000 square feet of state-of-the-art barrier systems dedicated to the production of certified pathogen-free rodents. Simonsen Laboratories' main facilities occupy over ten acres in California's beautiful Santa Clara Valley. As it has been for over sixty years, Simonsen Laboratories' main goal is customer satisfaction. Simonsen is committed to provide only the highest quality animals, backed by the personalized service of the Simonsen family. Simonsen Laboratories, Inc. is a member of the American Association for Laboratory Animal Science (AALAS).