John E. Reinhardt, who in 1971 became the first black U.S. ambassador to Nigeria and in 1977 the first career diplomat to lead the U.S. Information Agency, died Feb. 18 at a retirement community in Silver Spring, Md. He was 95. [...] Mr. Reinhardt led a transition for the organization, which had been renamed the International Communication Agency and included Voice of America broadcasts in addition to public-diplomacy outreach programs.