There aren't many absolute rulers around these days, on thrones or in executive suites, but S.I. ("Si") Newhouse Jr. comes close. Newhouse, 64, who controls the magazines-and-books principality of his family's $11 billion media empire, is accountable to no stockholders, keeps his own counsel and makes his own moves. When he is unhappy with the way things are going at one of his holdings, he is noted for acting stealthily, swiftly and at times brutally to make changes -- as editors at Vogue and Self magazines, among others, have learned to their sorrow.
What Newhouse has been unhappy about lately is...