But I knew I could do it and I'm proud we did it" [5] Duffy had various titles at Marc Jacobs International from 1984 to 2013 including Founder, chairman, Co-chairman, and President.
[7] In 2013 Robert Duffy stepped back from his day-to-day responsibilities at Marc Jacobs International to raise his young children.
Duffy started the "Protect the Skin You're In" cancer research project benefiting the NYU Langone Medical Center.
Over the years, he recruited celebrities and models to pose nude for t-shirts to raise money and awareness of malignant melanoma.
Celebrities who posed include Miley Cyrus, Eva Mendes, Milla Jovovich, Kate Upton, Victoria Beckham, Heidi Klum, Julian Moore, Hilary Swank, Christy Turlington and Naomi Campbell.
[10] Duffy supports numerous charities including New York University Cancer Center, the Hetrick-Martin Institute/Harvey Milk School, the Human Rights Campaign, amfAR, New York State land trusts & preservation organizations, The Rhinebeck Science Foundation, and the Provincetown Art Association and Museum.
[22][23][24] Duffy married Alex Cespedes, a native of Paraguay working in real estate, in Provincetown, Massachusetts on April 20, 2010.