"The Loudest Voice in the Room" has become a point of contention in the media business. It is a portrait of Roger Ailes, founder of Fox News Channel, the powerhouse conservative network.

Fox News is a living motif of Ailes, embodying his beliefs and opinions on everything from the Monica Lewinsky scandal to Justin Bieber, according to the book authored by Gabriel Sherman.

Through more than 600 interviews over a two-year period, with a team of two professional fact-checkers, Sherman constructed the most cohesive piece of writing on Ailes, a man who refuses to give interviews that aren't under his close scrutiny and prior review. Not even Sherman secured an interview with the media titan.

"Whether or not he granted me an extensive interview, he would not have changed my approach to the book because to tell the full story of Ailes and his power, you need to talk to everyone," he said.

The reason it's come under close fire from followers of the media industry - those who report on it and those who work in it - is because of the lacking critical interview.

"I'm very confident in the reporting. Any controversy about the book I'm ready for, because that's why we spent so long on the book and vetting it; so that once it's published, I stand behind it 150 percent," he said.

"It's a nuanced and full portrait of Ailes and his remarkable life. I mean, that's not saying there aren't controversial parts of the book.

"He has had a very controversial life. He's a larger-than-life personality. ... I think I capture him from all different camera angles," Sherman said. "That's why I needed to go out and talk to 600 people to try and get this full account."

Sherman's career as a journalist spans more than a decade and includes bylines in the New York Observer, New York Magazine and the New Republic, in which he's reported on the media industry, including The New York Times, CNN, MSNBC and Fox News.

"... The biggest in media is Fox News and the empire that Roger Ailes has built," he said.

"I wanted to do a book that explained how cable news transformed our political culture by using the news business into partisanship, and at the center of that story was the most dominant cable news network, Fox News, and its created by Roger Ailes," he said.

His reporting on Fox and Ailes has appeared as cover stories in New York Magazine. Sherman took a leave to pursue the book in a larger project with support from a Bernard L. Schwartz Fellowship at the New America Foundation, a nonpartisan think-tank in Washington, D.C.

"From that reporting, from the magazine reporting, I realized there was so much more that I wanted to dig into," he said. "I learned from my reporting that the real story was the man behind Fox News, Roger Ailes, because the network is a complete extension of his world view."

The book spans the career of Ailes, from when Fox News was a fledgling network, merely a blip on the teleprompter, to a thriving network following its extensive coverage of the Monica Lewinsky scandal in the '90s.

It was a touchstone point in the career of Ailes, whose brainchild grew from their coverage and the creation of shows surrounding the scandal.

As for the future of Fox, Sherman wasn't certain, saying that it entirely rests on the future of the senior Ailes.

"Everything on that channel is his production, his vision," Sherman said. "Without him, it will not exist in its present form. ... It will be something different."