This paper explores the possible measurable effects of mentors (major professors) on the subsequent productivity of the mentor's students. Also asked is whether there are benefits to the productive scientist who acts as a mentor. Analysis is based on a population of male biochemists (N=66) who obtained their doctorates in 1957, 1958, 1962, and 1963. Various measures of departmental, mentor and/or student productivity and prestige were obtained. Sources included biographic information from American Men (and Women) of Science and productivity indications from the Science Citation Index and Chemical Abstracts. Results indicate no visible mentor effects, unless the postdoctoral context is one in which research productivity is encouraged. Other results indicate that the productivity of former students positively influences the research visibility of the mentor. (CS)