Zimmerman is widely known to be one of "Today" co-host Matt Lauer's closest associates and confidants at the network. He worked for years as Lauer's personal booker, and expanded his remit to oversee all of NBC News' guest bookings as Lauer's power grew in the organization.

"We have recently learned that Matt Zimmerman engaged in inappropriate conduct with more than one woman at NBCU, which violated company policy. As a result he has been dismissed," an NBC News spokesperson told Fox News.

"We have recently learned that Matt Zimmerman engaged in inappropriate conduct with more than one woman at NBCU"

- NBC rep

Zimmerman's dismissal comes as NBC has faced embarrassment and a barrage of criticism for spiking an explosive expose on sexual misconduct by Hollywood mogul Harvey Weinstein. The New York Times would eventually break the story, which led to a barrage of high profile men being accused of sexual harassment.