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Sony Pictures Entertainment PR chief Charles Sipkins has left the studio after a little over a year in the post as executive VP of communications.

Chairman and CEO Michael Lynton said in a Friday afternoon notice to Sony staff, “Charlie Sipkins has resigned to pursue other opportunities. We thank him for his contributions and wish him success in the future.”

No immediate replacement has been set yet.

Sipkins had joined Sony in August 2013 after working as a managing director at crisis PR specialist  Sard Verbinnen. He had repped Peter Chernin, Yahoo, News Corp. and Groupon.

Sources at the studio told Variety that they were not surprised about Sipkins’ departure, noting that he had not worked at a studio prior to taking the Sony post.

Sipkins reported to Lynton and co-chairman Amy Pascal. When he came on board, the studio had been through a tough summer at the box office with “After Earth” and “White House Down” with hedge fund manager Daniel  Loeb complaining about the studio management.

Soon after Sipkins arrived, longtime PR execs Steve Elzer and Ann Boyd departed.

Sipkins is the latest in a long line of departures from Sony’s executive suite over the past year and half. Those have included Jeff Blake, chief of worldwide marketing and distribution chief; worldwide marketing president Marc Weinstock; Tommy Gargotta, worldwide president of creative advertising; home entertainment chief David Bishop; and Chris Cookson, president of Sony Pictures Technologies.

Also departing: Matt Brown, executive VP, worldwide commercial for Sony Pictures Home Entertainment; VP of global communications Jason Allen and home entertainment and acquisitions public relations head Fritz Friedman.