NEW YORK (AP) _ Hearst Magazines said Tuesday it hired the editor and president of New York magazine, Edward Kosner, to become editor-in-chief of Esquire magazine.

Terry McDonell, Esquire's current editor-in-chief, was named editor-in- chief and publisher of Hearst's Sports Afield magazine.

D. Claeys Bahrenburg, president of Hearst Magazines, said in a statement both appointments would become effective in mid-October.

Kosner has been editor of New York magazine since 1980, publisher since 1986 and president since 1991, Hearst said. Prior to joining New York, Kosner was with Newsweek for 16 years, serving as editor from 1975 to 1979.

A New York City native, Kosner worked as a writer and editor at the New York Post before joining Newsweek.

K-III Magazines, parent of New York magazine, named its managing editor, Peter Herbst, acting editor in charge of day-to-day operations and said it will search for a successor to Kosner.

McDonell will succeed Tom Paugh as editor-in-chief of Sports Afield, Hearst said. Paugh becomes editor emeritus until his retirement in April 1994.

Named editor-in-chief of Esquire in 1990, McDonell was previously editor- in-chief of Smart magazine, which he founded in 1988. Before that he was managing editor of Rolling Stone and assistant managing editor of Newsweek.