From 1986 to 1992 he was Dean's Professor of Science and Professor of Biology at San Francisco State University, and from 1993 until his death he was Adjunct Professor of Biology at Sonoma State University.
De 1986 a 1992 foi profesor de ciencias e de bioloxía na Universidade Estatal de San Francisco e, desde 1993 até a súa morte, foi profesor adxunto de bioloxía na Universidade Estatal de Sonoma.