RICHARD GWYN, who is one of Canada's most highly-regarded and widely-read columnists, is best-known as the author of the best selling "The Northern Magus," the first major biography of Pierre Trudeau. He has written four other books, including the high-praised "The Unlikely Revolutionary," a biography of Newfoundland Premier Joseph Smallwood, Gwyn writes a bi-weekly column for The Star, on both national and international affairs. He is the winner of awards for newspapers and magazines articles and for his books.