New York-It's another coup for Gruner + Jahr USA Publishing. The company said David Carey, publisher of The New Yorker, is stepping down to head its business magazine group. The move comes on the heels of G + J's purchase of Fast Company and Inc. magazines. Under Carey, who became the magazine's VP last year, The New Yorker had 2,408 advertising pages in 2000, up 16% from the year before, according to the Publishers Information Bureau. G + J CEO Dan Brewster has moved aggressively in the last few months to transform the once-sleepy publishing company, nearly 80% owned by German media conglomerate Bertelsmann AG.