Wall Street is losing one of its wittiest and most erudite cable and telecom analysts.  Paul de Sa, who recently left Bernstein Research, will rejoin the FCC later this month as chief of the Office of Strategic Planning and Policy Analysis, Chairman Tom Wheeler announced today.

The Office plays an important role advising regulators on policy initiatives. de Sa ran the unit from 2009 to 2012 when he joined Bernstein.

“Paul has a rare combination of business insight, technical expertise, and policy experience that will make him an invaluable addition to our team.” Wheeler says.

de Sa will replace Elizabeth Biley Andrion, who has been acting chief of the Office since January. She plans to leave the FCC.

Before joining the FCC, de Sa was a partner at McKinsey & Company. He has a doctorate  theoretical physics from Oxford, was a John F. Kennedy Memorial Scholar at MIT, and researched technology policy as a post-doctoral fellow at Harvard.