b. 1929
Harry Frankfurt (born 1929) is an American analytic philosopher emeritus at Princeton University, best known for his work on free will, moral responsibility, and the structure of human motivation. He fundamentally reoriented debates about free will by challenging the Principle of Alternate Possibilities and developing an influential account of agency grounded in hierarchical desires.
Introduced Frankfurt cases — thought experiments showing moral responsibility does not require the ability to do otherwise
Developed the hierarchical desires account of free will, distinguishing first-order desires from second-order volitions
Argued that free will and metaphysics are inseparable, reshaping how compatibilism is defended
Authored 'On Bullshit' (2005), a rigorous philosophical analysis of dishonesty that became a cultural touchstone
Contributed influential work on love, caring, and the nature of personal identity in 'The Reasons of Love' (2004)