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Cablevision Systems is expanding the ranks of its executive management team with the hiring of Gregg Seibert as an executive vice president, responsible for corporate strategy and business development, in addition to overseeing the company’s treasury and investor relations functions.

Siebert comes from Merrill Lynch, where he was most recently a senior vice president and chairman. During his two decades at the investment firm, clients he’s advised have included Cablevision, Comcast, Liberty Media and News Corp., among others.

Seibert will report directly to both Cablevision President and CEO James L. Dolan and Cablevision Vice Chairman Hank Ratner.

"Gregg has a substantial knowledge of the cable and telecommunications industries, as well as more than 20 years of experience in developing, executing and managing complex financial transactions and relationships," Dolan said.

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