C. J. "Keith" van Rijsbergen FREng (Cornelis Joost van Rijsbergen; born 1943) is a professor of computer science at the University of Glasgow, where he founded the Glasgow Information Retrieval Group. He is one of the founders of modern Information Retrieval and the author of the seminal monograph Information Retrieval and of the textbook The Geometry of Information Retrieval.
He was born in Rotterdam, and educated in the Netherlands, Indonesia, Namibia and Australia.
His first degree is in mathematics from the University of Western Australia, and in 1972 he completed a
PhD in computer science at the University of Cambridge. He spent three years lecturing in information retrieval and artificial intelligence at Monash University In 2006, he was awarded the Gerard Salton Award for Quantum haystacks. In 2009, he was made an honorary professor at the University of Edinburgh.