Frankfurt discussed by Bratman in his Griceian cybernetics

Among philosophers, Frankfurt was for a time best known for his interpretation of Descartes's rationalism, his account of freedom of the will (on which he has written numerous important papers[1]) based on his concept of higher-order volitions, and for developing what are known as "Frankfurt counterexamples" (i.e., thought experiments designed to show the possibility of situations in which a person could not have done other than he/she did, but in which our intuition is to say nonetheless that he/she acted freely). However, his later work on love and caring is now equally discussed.