Gray, Wesley R. (drexel University's Lebow College Of Business; University Of Chicago Booth School Of Business; The Wharton School, Vogel, Jack R. (drexel University's Lebow College Of Business; University Of Scranton) (2) Olthuis, Theo (1) Vogel, Hans (1) Houweling, Jos (1) Vogel, Friederike (1)