Bob Schieffer's last Face the Nation broadcast takes place Sunday morning, on CBS. Mr. Schieffer is retiring, after a long and very distinguished career. I've admired him for years; he's a superb reporter, political analyst, anchorman, and host. Like many other television viewers, I will miss watching him.
Here's a story about Mr. Schieffer, and his career, from Friday's New York Times:
http://www.nytimes.com/2015/05/30/business/media/bob-schieffer-of-face-the-nation-prepares-to-sign-off.html
By the way, I recommend Mr. Schieffer's 2003 memoir, This Just In: What I Couldn't Tell You on TV.
http://www.amazon.com/This-Just-What-Couldnt-Tell/dp/0399149716/