<p>Alfred Tarski (born Alfred Teitelbaum, January 14, 1901 – October 26, 1983) was a Polish logician, mathematician, and philosopher, known for his work in the foundations of mathematics and logic, particularly the concept of truth in formal languages.</p><p></p><p>Tarski began his academic career at the University of Warsaw, where he earned his PhD in mathematics in 1923. He later worked at the University of Lwów and the University of Warsaw, where he developed a formal theory of truth for formal languages. This theory, known as the Tarski's truth definition, is widely considered to be one of the most important contributions to the field of mathematical logic.</p><p></p><p>In 1939, Tarski left Poland for the United States to escape the Nazi occupation of Poland. He taught at the University of California, Berkeley, where he continued his work on the foundations of mathematics and logic. He also worked on the theory of algebraic systems and the concept of logical consequence.</p><p></p><p>Tarski's work in the foundations of mathematics and logic has had a profound impact on the field, and his work on the concept of truth in formal languages has been particularly influential. His ideas have been used in a wide range of fields, including computer science, artificial intelligence, and formal semantics.</p><p></p><p>In addition to his work in logic and mathematics, Tarski was also a philosopher and was interested in the foundations of ontology and metaphysics. He published several papers on these topics, including "The Concept of Truth in Formalized Languages" and "The Concept of Truth in Mathematics."</p><p></p><p>Tarski's work has been honored with numerous awards and honors, including being elected as a Fellow of the American Academy of Arts and Sciences in 1950. He died in 1983.</p><p></p><p>Alfred Tarski is widely considered one of the most important figures in the history of logic and mathematics. His work on the concept of truth in formal languages and his contributions to the foundations of mathematics have had a lasting impact on the field and continue to be studied and used today. Tarski's legacy continues to influence and inspire researchers and scholars in mathematics, logic, computer science and philosophy.</p><p></p><p></p>