Successful songwriter and producer, writing U.S. No. 1 "Physical" for Olivia Newton-John in 1981, and co-writing/co-producing U.K. No. 1 singles including "Genie In a Bottle" for Christina Aguilera, "These Words" for Natasha Bedingfield and "Fight For This Love" for Cheryl Cole, which reached the top in October 2009.