Warren continues to write hit songs for and with artists of all mainstream genres, including Bette Midler, Stevie B., Celine Dion, Cheap Trick, En Vogue, Whitney Houston, Belinda Carlisle, Taylor Dayne, Britney Spears, Marcia Hines, Alice Cooper, Christina Aguilera, Beyoncé, TLC, Aaliyah, Heart, Agnetha Fältskog, Elton John, Cher, Tina Turner, Bryan Adams, Selena, Jessica Simpson, Air Supply, Olivia Newton-John, Barbra Streisand, Aretha Franklin, Roberta Flack, Roy Orbison, Trisha Yearwood, Patti LaBelle, Michael Bolton, NSYNC, Rene Froger, Gloria Estefan, Reba McEntire, Enrique Iglesias, Paloma Faith, Russell Watson, Rod Stewart, RBD, Aerosmith, The Cult, Kiss, Ricky Martin, Faith Hill, Michael W. Smith, Meat Loaf, Sugababes, Mariah Carey, Toni Braxton, Exposé, Leigh Nash of Sixpence None the Richer, LeAnn Rimes, Gavin DeGraw, Kierra Sheard, Mandy Moore, Hilary Duff, Haylie Duff, Lindsay Lohan, Lady Gaga, Chrissy Metz, Claire Richards, Starship, and Westlife, producing some of the songs as well.