Edmund Gettier

Edmund Lee Gettier III was an American philosopher, born on October 31, 1927, in Baltimore, Maryland. He is renowned for his seminal 1963 paper, "Is Justified True Belief Knowledge?", published in the journal *Analysis*. This brief but highly influential article presented counterexamples that challenged the long-standing definition of knowledge as justified true belief, a definition traced back to Plato's *Theaetetus*. Gettier's examples demonstrated scenarios where individuals held beliefs that were both true and justified, yet intuitively did not constitute knowledge. These counterexamples gave rise to what is now famously known as the "Gettier problem" and spurred extensive debate and research within the field of epistemology, aiming to refine or replace the justified true belief model. Gettier pursued his academic career at Johns Hopkins University, earning a B.A. in 1949, and later a PhD from Cornell University in 1961, where his dissertation focused on Bertrand Russell's theories of belief under the supervision of Norman Malcolm. He taught philosophy at Wayne State University from 1957 to 1967, and subsequently at the University of Massachusetts Amherst from 1967 until his retirement as professor emeritus in 2001. His contributions, though limited in quantity, have had a profound and lasting impact on contemporary epistemology. Gettier passed away on March 23, 2021, at the age of 93.