Biochemist International Nutrition Research Foundation, Riverside, California, 1961-1965. Assistant professor Nutrition, School Public Health Loma Linda (California) University, 1968-1973, associate professor of Nutrition, 1973-1974. Professor Biochemistry and Nutrition Universidad de Montemorelos, Mexico, 1974-1980, assistant dean, School Medicine Mexico, 1978-1980.
Associate professor Nutrition Loma Linda University, 1980-1982, professor Nutrition, 1982-1991. Adjunct professor Universidad de Montemorelos School Medicine, since 1985. Program coordinator, director Spanish department Pacific Health Education Center, since 1991.
Adjunct professor Loma Linda University, since 1992. President International Nutrition Research Foundation, Loma Linda, 1989-1991.