[applause] it is my pleasure to introduce kwame anthony appiah ehud has approached with the rigorous combination of humanity and find a bridge african-american intellectual history and political boss of the. appiah is a thinker and a writer and is warm and reflective and accessible and challenging and generous as he is as a friend. a premier scholar of contemporary philosophical thought, his work crosses discipline as it crosses national boundaries. and celebrates human-rights, ethnic and cultural pluralism, but identity, liberty, and a sublime mood of cosmopolitan. let me review just a few of appiah accomplishments before talking about his new book "the honor code" how moral revolutions happen." educating gotta, england, we met 37 years ago at the university of cambridge he quickly rose to prominence as it philosopher of semantics at the intersection of the philosophy of language and the philosophy of mind and now the rockefeller university professor of philosophy and prior to arriving at princeton he taught at yale and cornell and duke we collaborated realizing w. b. dubois a dream