Marley has been employed in the entertainment industry for the past 29 years as a biographical writer, music and television producer, artist development executive, publicist and author. Her entertainment affiliations are extensive and she has worked with a wide variety of rock and country artists; actors; directors; on numerous television, radio and film productions; toured with major rock acts; and assisted in the successful development of new acts. Marley’s expertise working with artists was recognized when she was appointed assistant national director of artist development and publicity/artist relations and tour coordination with Chrysalis Records where she worked with artists Jethro Tull, Robin Trower, Rory Gallagher, Leo Sayer, Genesis, The Babys, Split Enz, Frankie Miller Band, Nick Gilder, UFO, Blondie, and dozens of others. In 1979, Marley was employed by Paramount Television, where she worked closely with the cast and crews of many of Paramount’s premier television and mini-series including Happy Days, Mork & Mindy, Laverne & Shirley, Taxi and Bosom Buddies. Marley joined the international public relations firm of ICPR and was involved with films such as Costa Gravis’ “Missing”, “Stripes”, “The Chosen” and “Clash of the Titans” and was account executive for several television programs such as Fame, Solid Gold, The Devlin File, Greatest American Hero, and The Tom Jones Show as well as several television movies. Deciding to freelance, Marley co-produced the album Gram Parsons and the Fallen Angels, Live, 1973, which resulted in a Grammy nomination for Gram Parsons and Emmylou Harris. She served as the co-creator, associate producer, and historical consultant on TBS’ three-hour television special Outlaws, Rebels and Rogues.

Marley is the author of eight published books which have been reviewed in the New York Times, Los Angeles Times, Publishers Weekly, Booklist, Library Journal and dozens of other major publications. Marley's books have been the featured research in television programs which have aired on A&E, The History Channel, VH1, TBS and CMT.