Michael Stock (born 3 December 1951) is an English songwriter, record producer, musician, and member of the songwriting and production team Stock Aitken and Waterman. He has written and/or produced 18 No. 1 records in America and the UK, over a hundred top-40 hits and is recognised as one of the most successful songwriters of all time by the Guinness Book of Records. As part of Stock Aitken and Waterman in the 1980s and 90s, he holds the UK record of 11 number one records with different acts. In the UK Singles Chart he has written 54 top-ten hits including 7 number ones.