After Lewin's death in 1947, Festinger moved with the research center to the University of Michigan in 1948. He then moved to the University of Minnesota in 1951, and then on to Stanford University in 1955. During this time, Festinger published his highly influential paper on social comparison theory, extending his prior theory regarding the evaluation of attitudes in social groups to the evaluation of abilities in social groups. Following this, in 1957, Festinger published his theory of cognitive dissonance, arguably his most famous and influential contribution to the field of social psychology. Some also view this as an extension of Festinger's prior work on group pressures toward resolving discrepancies in attitudes and abilities within social groups to how the individual resolves discrepancies at the cognitive level. Festinger also received considerable recognition during this time for his work, both from within the field, being awarded the Distinguished Scientific Contribution Award by the American Psychological Association in 1959, and outside of the field, being named as one of America's ten most promising scientists by "Fortune" magazine shortly after publishing social comparison theory.