Four years after Heather Marks was scouted, she debuted on the Givenchy runway at Paris Fashion Week. The same season she walked for Anna Sui, Burberry, Marni, Chanel, Dries Van Noten, and Louis Vuitton in New York and Milan, as well as Paris. From that point, Marks' career took flight and she began to be be booked for numerous fashion shows and other gigs. Amongst the top designers that Marks has worked with are: Christian Lacroix, Viktor & Rolf, and Salvatore Ferragamo, amongst others.
In 2006, the Canadian model walked at the annual Victoria's Secret Fashion Show. She is most famed for her big eyes and doll-like appearance.
Marks’ modelling career has flourished both on the catwalk and off. In 2004, she was chosen to be the face of Moschino and also starred in advertising campaigns for names like Levi's, D&G, and Ann Taylor. Marks has also featured in campaigns for Anna Sui (2005), D&G (2006), Lacoste (2007), and more.
Marks has an English Bulldog called Otis. She enjoys spending time with her family, friends, and dog; and once a year takes a relaxing trip to her private holiday cabin in Shuswap, British Columbia.