 Complete the following phrase:  Between 1986 and 1992, as senior assistant editor and director of layout and design, he was in charge of the presentation of all visual material in National Geographic. Over this period, he and his fellow workers won many awards for photography, art, and design. In 1966, he was named College Photographer of the Year; in 1971, U.S. Photographer of the Year; and in 1976, Magazine Photographer of the Year. The Overseas Press Club designated his coverage of the 