According to reports, MTV Networks' president and COO Michael Wolf will exit the company in February, a mere 15 months after assuming the position. Also exiting MTVN is Nicole Browning, president of affiliate sales and marketing, who's been with the company for the past two decades.

The departures follow the ousting last fall of former Viacom chief executive Tom Freston and call into question the job stability of MTVN chief executive Judy McGrath.

Viacom CEO Philippe Dauman, who replaced Freston, has been pushing McGrath to ramp up the group's performance after the ratings for three highly visible MTVN channels plunged by double digits in primetime last year: Nick at Nite by 21%, Spike TV by 19% and MTV by 10%.

Wolf, a former entertainment consultant at McKinsey & Co., was brought onboard in November 2005 after having served as a consultant to the company's senior management team for more than a decade.

A 20-year MTVN veteran, Browning oversaw distribution for all the MTV nets, as well as the BET Networks division.