The Sun, the U.K. newspaper owned by News Corp., said Dominic Mohan quit after four years as editor to take a senior role in Rupert Murdoch's publishing empire. Mohan will report to Robert Thomson, the newly appointed chief executive officer of News Corp.'s publishing business, and will explore strategic opportunities for the company in Europe, according to a statement. The print unit began trading as a separate stock this week and will become an independent company on June 28.