The results of six studies concerning medical school faculty and clinical research personnel are presented. The studies concern: (1) career research productivity of physician faculty; (2) accession and attrition of medical school faculty who are recent physician graduates; (3) comparison of training programs for physician scientists; (4) the research involvement plans of 1980 MD graduates; (5) national estimates of U.S. medical faculty for 1975-1976 through 1977-1978; and (6) projections of replacement needs for medical school faculty, 1980-1990. Specific considerations include: estimated annual publication rates of MD faculty by specialty and career age; longitudinal estimates of the proportions of successive graduating classes of medical students who become faculty members at U.S. medical schools; plans of 10,000 medical school seniors concerning research fellowships and careers and factors that influence those plans; annual medical faculty accession (first-time hiring) and loss (death, retirement) by rank and department during 1976 to 1978; predicted age distributions of all full-time faculty members through 1990; and rates of faculty accession, research involvement, competitive grant success, and research publication for graduates of four physical science training programs. (SW)