John McCarthy was an influential American mathematician and computer scientist known as a pioneer in the field of artificial intelligence (AI). He coined the term "artificial intelligence" in 1955 and made foundational contributions to AI research, including the invention of the Lisp programming language in 1958 and the development of time-sharing systems. McCarthy was a professor at Stanford University, where he founded the Stanford Artificial Intelligence Laboratory (SAIL). He received numerous prestigious awards such as the Turing Award in 1971 and the National Medal of Science in 1990. He passed away in 2011, but his work continues to significantly shape the AI field.