Top-level turnover. (Bylines).(Brief Article)

Two-and-a-half years after hiring John F Oppedahl as publisher of its newly purchased San Francisco Chronicle, Hearst Corp. replaces him with Steven Falk, formerly associate publisher and chief operating officer. Falk, 48 who retains the title of president, worn out 15 years with the San Francisco Newspaper Agency. Editorial staffers say Oppedahl, who did not suit to an interview request, not at any time visited the newsroom. In contrast, many know Falk and describe him as personable and a straight shooter He began by the agency of "preaching the gospel," as he calls it, stressing that the