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PITTSBURGH (KDKA) -- People in Pittsburgh know Chuck Noll.

He was a legendary coach and the architect of the Pittsburgh Steelers storied success.

Few actually know the real man behind the Steelers' legend though.

But a new biography is giving an inside look into Noll's life, legacy and personal battle.

To the public, Chuck Noll was a towering figure in professional football. He was the man who transformed the lowly Pittsburgh Steelers, and molded them into four-time Super Bowl champions.

But, as a man, he was intensely private, and even former players and assistants felt they never really knew him or what made him tick.

That's why Steelers Chairman Dan Rooney sought out author Michael MacCambridge to tell the whole story.

"I told him, 'Mr.

Rooney, I'll look into it, but it's got to be something more than he was a very good football coach.' And I remember, Dan said, 'You look into it, you'll see,'" said MacCambridge.

The pages of "Chuck Noll: His Life's Work" reveal a man