Dr. Robert Aronowitz is chair of the department of History and Sociology of Science at the University of Pennsylvania. Stephen Morrissey, the interviewer, is the Executive Managing Editor of the Journal. R. Aronowitz and J.A. Greene. Contingent Knowledge and Looping Effects — A 66-Year-Old Man with PSA-Detected Prostate Cancer and Regrets. N Engl J Med 2019;