Cablevision
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Leadership > Gregg G. Seibert

Gregg G. Seibert

Gregg G. Seibert

Vice Chairman

Gregg Seibert serves as vice chairman of Cablevision Systems Corporation, working on the company's overall long-term strategic and financial initiatives. As a senior member of Cablevision's leadership team, he provides strategic and financial counsel to the company. In 2015, The Madison Square Garden Company and AMC Networks Inc. also appointed Mr. Seibert vice chairman of their respective companies.

In addition to his role as vice chairman, Mr. Seibert also previously served as Cablevision's chief financial officer where he oversaw the company's finance and accounting matters as well as its taxation and risk management functions. He was also responsible for all treasury, investor relations and business development activities for the company.

Since joining Cablevision in 2009, Mr. Seibert has played an instrumental role in a number of the company's key strategic initiatives including the spin-offs of The Madison Square Garden Company and AMC Networks Inc., and the acquisition of and subsequent sale of Bresnan Communications. He also has overseen a number of financing transactions that have significantly improved the company's financial profile.Furthermore, he handled capital and cash management as well as the communication of the company's operational and financial objectives to individual and institutional shareholders, financial analysts and investment managers.

Before joining Cablevision, Mr. Seibert held several senior leadership positions at Merrill Lynch including vice chairman, head of corporate finance and head of the global media practice.

Mr. Seibert received his MBA from the Wharton School of the University of Pennsylvania.

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