Katie Couric is an American journalist and author who is mostly known for her television news roles. She has a been a host on all of the "Big Three" television networks (ABC, CBS, and NBC). She has also worked as a daytime talk show host. such as being a "Today" co-host. She is also famous for becoming the first woman to anchor "CBS Evening News" alone in 2006 and being a "60 Minutes" correspondent. Some of her distinctions include being inducted to the Television Hall of Fame in 2004 and having a New York TImes best-selling book. She recently worked as the Yahoo! Global News Anchor.

Sources: https://en.wikipedia.org/wiki/Big_Three_television_networks , http://katiecouric.com/ , https://www.biography.com/people/katie-couric-9542060