Tunisian-born and Sorbonne-educated Sami Hassoumi, a one-time resident of Paris, specializes in $2 million-and-up luxury townhouses, condominiums and co-ops. With Brown Harris Stevens since February 1996, he is one of the firm's top producers. His townhouse sales, mainly to live-in owners and investors from overseas, have been some of the more outstanding examples in Manhattan, including 31 Beekman Place, 15 East 88th Street, 7 East 67th Street, 17 East 75th Street and 161 East 64th Street.