In many respects, Susan Wojcicki is Google’s most important patron. Her garage served as the original Google headquarters, and over the last decade the svp of advertising has grown the company’s advertising business into a $43.7 billion revenue stream as of last year. EMarketer projects that Google accounts for better than 41 percent of total digital ad revenue in the U.S. As more advertising dollars transition to digital, Google becomes ever more a proxy for the entire ad business. That shift positions Wojcicki alongside WPP’s Sir Martin Sorrell and CBS’ Les Moonves in the traditionally male-dominated echelon of advertising’s elite. Earlier this month, Adweek sat down with Wojcicki at the company’s Mountain View, Calif., campus to pick her brain on Google’s past, present and future. After all, as goes Google, so goes advertising.