Oxford University Press (OUP) is the largest university press in the world, and the second oldest after Cambridge University Press. It is a department of the University of Oxford and is governed by a group of 15 academics appointed by the vice-chancellor known as the delegates of the press. They are headed by the secretary to the delegates, who serves as OUP's chief executive and as its major representative on other university bodies. Oxford University has used a similar system to oversee OUP since the 17th century. 

The university became involved in the print trade around 1480, and grew into a major printer of Bibles, prayer books, and scholarly works. OUP took on the project that became the "Oxford English Dictionary" in the late 19th century, and expanded to meet the ever-rising costs of the work. As a result, the last hundred years has seen Oxford publish children's books, school text books, music, journals, the World's Classics series, and a best-selling range of English language teaching texts to match its academic and religious titles. Moves into international markets led to OUP opening its own offices outside the United Kingdom, beginning with New York City in 1896. With the advent of computer technology and increasingly harsh trading conditions, the Press's printing house at Oxford was closed in 1989, and its former paper mill at Wolvercote was demolished in 2004. By contracting out its printing and binding operations, the modern OUP publishes some 6,000 new titles around the world each year. As part of a charitable organization, OUP is committed to major financial support of its parent university, and furthers the university's aims of excellence in scholarship, research, and education through its publishing activities.
What was their famous project?
OUP took on the project that became the "Oxford English Dictionary"