Julian Niccolini has absolute control over one of New York’s most sought-after treasures: a good table. As co-owner of the Four Seasons and M.C. of its daily lunchtime pageant of boldface names, Mr. Niccolini decides who gets in the door of the restaurant’s famed Grill Room and, most importantly, where everyone sits. Among the city’s power brokers, getting a good table at the Four Seasons is still a badge of social significance, and Mr. Niccolini is the only man who can bestow that honor, as he does every day when he maps out the lunchtime seating chart. But the native Italian (who started at the restaurant in 1977) is not only the gatekeeper to the city’s unofficial boardroom, he is also its Cupid: put an up-and-coming actress near Harvey Weinstein and maybe she becomes a star; put the newbie tech guys in Barry Diller’s eyeline and maybe they become millionaires. Here’s a safe bet: if a news anchor is breathlessly reporting on a new billion-dollar corporate deal, Mr. Niccolini probably knew about it first.