When Shelley graduated from Smith College in 1970, she decided to become a model full-time. Represented by the top model management company, Ford Models Inc., she began her transition from teen model to top model (and eventually to Supermodel.) Her then boyfriend, photographer Steen Svensson, and make-up artist extraordinaire Rick Gillette came up with test shots of Shelley in the early '70s with the hope that the images could get her on the pages of Vogue and Harper's Bazaar - which eventually happened. She appeared on both the US and international editions of the magazines. According to Rick, "In the early 70’s before "Charlie", before "Charlie’s Angels", Shelley Hack was an ex-teen model looking for a more sophisticated look to get her into Vogue. I was creating a portfolio with the same goal in mind." By the late 1970s, Shelley was a certified Supermodel.