Guillemet has worked in key positions in the film industry for over twenty-five years. For over fifteen years she served as Vice President of the Sundance Institute and Co-Director of the Sundance Film Festival. At the 2000 Sundance Film Festival, she launched the Documentary Film Program and its "House of Docs" to provide support to documentary filmmakers. In 2002, she founded the Utah Film Center bringing the world of film to local audience, emphasizing social content and artistic excellence.
From 2002 - 2007, Guillemet was the Director of the Miami International Film Festival, showcasing the most important selection of Ibero-American Cinema in North America. She created Miami Encuentros, a program to help emerging Ibero-American producers.
In the last seven years Guillemet has worked as an executive consultant for various international festivals including the Costa Rica International Film Festival and the Dominican Republic Global Film Festival as Program Director, the Middle East International Film Festival, the Bahamas International Film Festival, and ESAV, the Marrakech School of Film and Design supporting new Arabic cinema. She is an Executive Producer of the Oscars nominated documentary The Square (2013) by Jehane Noujaim.
In 2005 she was awarded the Chevalier of the ordre des Arts et des Lettres from the French Minister of Culture.
