• AP, Tuesday, September 7, 2010 10:42 PM

ABC News President David Westin, the longest-reigning network news division chief, with more than 13 tumultuous years on the job, told his staff Monday that he is resigning and will leave by the end of the year. Westin has presided over anchor changes at three of ABC's top news programs over the past year

ABC has remained a solid second in the ratings behind NBC News for its evening and morning newscasts, and "Nightline" made a strong transition from charter anchor Ted Koppel. Within the past year, Westin has appointed Diane Sawyer to replace Charles Gibson as anchor of the signature "World News" broadcast, moved George Stephanopoulos from Washington to New York to co-host "Good Morning America" with Robin Roberts and hired Christiane Amanpour from CNN to lead the Sunday morning "This Week" political talk show.

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