Kent Beck is one of the three creators of the agile process extreme programming, and is the author of the books "Extreme Programming Explained. Embrace Change", ISBN 0201616416, "Test Driven Development: by example", ISBN 0321146530, and "Planning Extreme Programming", with Martin Fowler, ISBN 0201710919.
See Kent's presentation on another wiki website, http://www.c2.com/cgi/wiki?KentBeck