Andrew Rosen

Andrew Rosen is an American fashion executive, merchant and investor whose career grew out of a third-generation garment business. He began at his family’s Puritan Fashions in the late 1970s, worked through senior roles connected to Calvin Klein and Anne Klein, and developed a reputation for reading product through the customer, the sales floor and the economics of scale.

In 1997, Rosen co-founded Theory with Elie Tahari and built the New York label around stretch trousers, precise shirts and an urban wardrobe that helped define the American contemporary market. He remained the company’s operating leader through its 2003 sale into the Link Theory structure and Fast Retailing’s later consolidation, serving as chief executive until April 2019 and then moving into a founder and adviser role.

Rosen has also spent much of his career backing and mentoring other American labels. His investments and advisory relationships have included Rag & Bone, Alice + Olivia, Proenza Schouler, Veronica Beard and TWP, and in 2024 he became executive chair of Rag & Bone following its acquisition by Guess and WHP Global. His influence sits at the intersection of product, retail, financing and long-term brand building.

Rosen approaches fashion as a merchant with a strong product instinct. Fit, fabric, price, repeatability and the realities of how people live carry as much weight as image, and his work at Theory turned that discipline into a coherent wardrobe system built around comfort, mobility and polish.

His wider career extends the same logic to investment and mentorship. Rosen has tended to support designers whose creative identity can be matched with durable operations, distribution and customer understanding, giving his contribution to American fashion a structural dimension alongside his role in shaping Theory.