Professor Gibbard's two books, Wise Choices, Apt Feelings (1990) and Thinking How to Live (2003) develop a general theory of moral judgments and judgments of rationality. Wise Choices draws on psychology, anthropology, and evolutionary theory, and Thinking How to Live draws further consequences for how normative concepts work. Besides writing widely in ethical theory, he has made important contributions to the theories of conditionals, identity, and voting. He has held ACLS, Guggenheim, NEH, and Rockefeller research fellowships, and been elected Fellow of the American Academy of Arts and Sciences, Member of the American Philosophical Society, and Fellow of the Econometric Society. He has been President of  the Central Division of the American Philosophical Association. On April 28, 2009 Professor Gibbard was elected to the National Academy of Sciences.