It may be one of the greatest mysteries of the 20th century. Who was Deep Throat? Who was the White House insider who tipped off the Washington Post reporters Bob Woodward and Carl Bernstein?

Based on information from Deep Throat, Woodward and Bernstein began to piece together the deep secrets of the White House. Their stories led to the demise of President Nixon’s presidency.

For nearly three decades the person’s identity has been unknown to but a handful at the Washington Post.

But now after a four-year investigation, a University of Illinois journalism professor and his class believe they have solved the mystery.

The professor, William Gaines, joins us now?. so tell us who was Deep Throat?

• William Gaines, University of Illinois professor and two-time Pulitzer-prize winner journalist with the Chicago Tribune.

Related link:

• Deep Throat Uncovered