Sadajirō Yamanaka
Yamanaka Sadajirō (山中定次郎, August 20, 1866 - October 30, 1936) was an Osaka, Japan-based art dealer who arrived in the United States in 1894, opening a small antique shop in Chelsea, New York City, Boston (1899) and London (1900); also an agent in Paris (1905). He subsequently founded Yamanaka & Company, which in 1917 took over a five-story building on Fifth Avenue in Manhattan.