Tony Horwitz was one of those people who had a way with words, both written and spoken. In even the most casual of conversations, along the sidelines of our boys’ lacrosse games, waiting in line at the Galley, or at a social function, he could make you ponder the deepest of topics and drop to your knees with belly-aching laughter. His most recent book, Spying on the South: An Odyssey Across the American Divide, follows the path of Frederick Law Olmsted before his days as an urban planner.