Harry Frankfurt

 Harry Gordon Frankfurt (born May 29, 1929) is an American philosopher. He is professor emeritus of philosophy at Princeton University and has previously taught at Yale University and Rockefeller University. He obtained his B.A. in 1949 and Ph.D. in 1954 from Johns Hopkins University. His major areas of interest include moral philosophy, philosophy of mind and action, and 17th century rationalism. His 1986 paperOn Bullshit, a philosophical investigation of the concept of "bullshit", was republished as a book in 2005 and became a surprise bestseller, leading to media appearances such as Jon Stewart's The Daily Show. In 2006 he released a companion book, On Truth, which explores society's loss of appreciation for truth.