Bob Schieffer, one of the legendary figures of network television news whose career spans 50 years and nine presidents, will retire this summer, he announced Wednesday evening. 

Schieffer, 78, announced his decision during a symposium named in his honor at Texas Christian University, his alma mater.

"Because that was where it all started for me, I wanted this to be the place, and I wanted you all to be the first to know that this summer I'm going to retire," he said. "It's been a great adventure. You know, I'm one of the luckiest people in the world because as a little boy, as a young reporter, I always wanted to be a journalist, and I got to do that. And not many people get to do that, and I couldn't have asked for a better life or something that was more fun and more fulfilling."