Karl Seff received his B.S. degree from the University of California at Berkeley in 1959 and his Ph.D. from the Massachusetts Institute of Technology in 1964. After three years of post-doctoral work at U.C.L.A., he joined the faculty of the chemistry department at the University of Hawaii. In 1988-89, he spent a year in Oxford, England studying pulsed-neutron diffraction from zeolite powders. His efforts in X-ray and neutron crystallography are directed mostly at the determination of the structures of chemically modified zeolites, to identify new species synthesized in intrazeolitic voids.