“No, I totally trust you,” he told her.

Of course, clarity is not a trait unique to Google’s founders. Steve Jobs has demonstrated prescience with several transformative innovations: the first Macintosh, Pixar, the iPod and iTunes, and now the iPhone. Bill Gates was clear about the value of software, a clarity IBM lacked when it ceded the operating system to Microsoft. By insisting that craigslist.org be a free site for most classified ads, Craig Newmark knew, he said, that by sacrificing revenues “people saw values we believed in and picked up on it.” He knew he was building trust.

Page and Brin’s clarity was abetted by the CEO they chose as their partner, Eric Schmidt. Aside from the bumps they had the first few years, it is the overwhelming opinion of those who work with them that the three men have a smooth working relationship. Sheryl Sandberg observed that the reason the troika “works is that whoever you go to for an answer, that answer sticks.” When you have two parents, a child can usually play one off against the other, she said. But at Google even if one of the three disagrees, he will back the decision. Brin said of Schmidt, “Eric is the leader for the company. Larry and Eric and I all share in the top-level leadership, but mostly Eric takes on the hardest challenges. Larry and I can spend more time on products and technology.”

Success in the Valley requires more than good engineers and passion, said Bill Campbell, pointing to the brilliant engineers and divided management that could not save Netscape, or how the passion of founder Jonathan Abrams, who founded Friendster, the pioneer social network site, was no substitute for missing management, and is a reason Friendster was eclipsed by Facebook. “I can’t imagine that anyone could have done what Eric has done. He matches what this company needs. You’ve got founders that have their unique passions, and they have an unusual amount of strategic insight. Applying that to a business model and making sure that the trains are running on time-and at the same time never losing the technology vision-is a feat. Eric’s technology skills mean that no one can bullshit him. You can bullshit me. I’m not an engineer.”

Being an engineer, alone, is not enough. Oracle has thrived for a long time as a company founded and headed by Larry Ellison, who is not an engineer. Ditto Apple under Steve Jobs. This point is made by Dan Rosensweig, the former COO of Yahoo who is today the CEO of Activision Blizzard’s Guitar Hero franchise. What makes a successful CEO, he said, “is a balanced appreciation” of the many factors, including engineering, an entrepreneurial and business culture, plus good management. In defense of his friend Terry Semel, he added, “When Terry ran a movie studio he wasn’t a director or an actor. Yet he and Bob Daly ran one of the great studios.”

The youth of the founders sometimes leads to sneering that an adult like Schmidt was essential to managing Google. “It borders on insulting to say that Eric provides ‘adult supervision.’ It is insulting to both,” Elliot Schrage said. Yet there are times when Schmidt does supervise, playing a role he likens to “a catcher” who retrieves “loose balls.” For example, at the conclusion of a Google Zeitgeist conference, the founders and Schmidt hosted a lunch for fewer than a dozen journalists in a conference room on campus. In an earlier interview, I had asked Schmidt how he felt about the federal Patriot Act, which grants the president superseding power to tap phones or e-mails to investigate potential terrorism. “I’m not a big fan,” Schmidt said. “I’m offering you my personal opinion as a citizen.” At the press lunch, the three men sat at the head of a long table, and as a preface to a question I mentioned that two years earlier Google had challenged a Justice Department subpoena that the company share information about search queries involving pornography, and Google took them to court and won. Given that, I asked, what was Google’s posture toward the Patriot Act?

“I’m not an expert on the Patriot Act,” Brin began, “but it’s certainly a long-standing issue prior to the Patriot Act…”

“Can I?” Schmidt interrupted. Not waiting for permission, he proceeded to say: “The best way to answer this question is to say it’s the law of the land and we have to follow it.”

“Or in some cases we fought it in court,” Brin began again, referring to the court victory on whether Google must turn over search requests involving pornography. Again, Schmidt interrupted, steering Brin away from any possible don‘t-be-evil proclamations. Schmidt said, “We fought it legally, and we followed the law, and we won in court.”

There are times when Schmidt appears obsequious to the founders, as when he introduced Page at the annual meeting of Google shareholders as “the best business partner in the world.” But then, “every once in awhile,” a Google executive said, “he does this unintentional condescending thing, and he does it in public settings.”

What Schmidt clearly brought to Google was experience the founders lacked. Experience often brings seasoned judgment. “Eric is the person who said, ‘We did this at Sun,”’ said Sandberg. “Eric instilled some business discipline. Before Eric started, our engineering team was going to build a finance system.” She recalled that he told them “This is not a good use of our resources. We’ll buy the software program.” Michael Moritz, who as a director was unhappy with Schmidt’s toughness during his first year at the helm, now said, “I’ve become a huge cheerleader and fully paid-up member of his fan club. He’s done the most important thing for a chief executive, and that’s to recruit and lead a wonderful management team.”

Andrew Lack, then the chairman and CEO of Sony Music, who is a friend of Schmidt‘s, remembers an incident at the 2005 World Economic Forum in Davos. Arthur Sulzberger, Jr., the chairman of the New York Times Company and publisher of its flagship newspaper, spoke at a dinner attended by Schmidt and about fifty media executives and journalists. Schmidt remembers the evening vividly, thinking, “I was the guest.” What he did not know, said Lack, was that he “would become a target.” Sulzberger, who despite his august position can be surprisingly supercilious, rose and accused Google of “stealing his business,” his advertisers, his content. Sulzberger has another side, as a staunch defender of journalistic values-a reason many in the Times newsroom believe he nobly stands between them and the financial barbarians-and he then made an eloquent plea for the importance and future of newspapers, before coming back to Schmidt and underscoring his animus toward Google.

The room was tense when Schmidt rose to respond. He defused it with humor, said Lack, referring to himself “as the skunk at my garden party. I can feel in this room, shall we say, a certain indifference towards my contribution to all of our work together, and I feel sorry about that, because I think there are great contributions to be made working together.” Schmidt acknowledged that Google and the Internet can negatively affect newspapers and other media businesses, but ended by urging them to talk and search for ways to work together. Sulzberger said he had “no recollection of the specific incident,” adding, “You can certainly check with Eric on this.” Eric Schmidt confirmed Lack’s account.

“I admired Eric for the way he handled himself,” Lack said. “There was no armor to him, no bluff, no bravado.”

By 2004, relations between Schmidt and the founders were harmonious. The founders are happy with Schmidt, said one longtime Google executive who did not want to be quoted, because “Eric does everything they don’t want to do.” Bill Campbell sees it from another angle. He lavished praise on Page and Brin for their entrepreneurial brilliance and inquisitiveness. But he added, “Here’s the part you don’t see: Let’s assume they had ten ideas they thought were great. Let’s assume they applied six of them. That gauge of what you can apply and what you can’t is where Eric comes in big time. These guys decide this is what they want to do, and Eric will say, ‘This is worth fighting for. This is a really important thing. Let’s go do that. Let’s pull that, it will take us a little off track.’ What Eric has, and the founders are the first to say, is judgment, judgment, judgment. He knows when to take their initiatives and drive them to a conclusion, or to talk them out of it.”