After graduating college with a major in fine art and a minor in architecture, Feigenbaum began his career with an entry level visual merchandising position at Korvettes Department Store. His next  position was at Stern's Department Store, a division of Federated Department Stores, where he quickly rose through the ranks to Corporate Director of Visual Merchandising. In that capacity, he directed a team of 65 associates on the corporate and branch store levels. He developed all visual merchandising programs and standards for the daily operation of 29 stores, while overseeing visual programs for renovations and new store openings. He also served as the chair of Federated's Visual Directors' Team. He later went to WalkerGroup/CNI as their Director of Visual Merchandising, where he was involved with the design of stores all over the world. In that role, he also wrote visual merchandising manuals for retailers in Chile, Peru, and South Korea. These manuals were tailored to support each organization's brand image. Feigenbaum still provides these services today, most recently for a retailer in Istanbul. 

A founding member of the Planning and Visual Education Partnership (PAVE) and the Vice President Emeritus and former Chair of its Education Committee, Feigenbaum has also served as Chair of the Society of Visual Merchandisers and on the Retail Advisory Committee for Display & Design Ideas magazine.