Tim Appenzeller, the science editor of National Geographic, won this year's Walter Sullivan Award for Excellence in Science Journalism from the American Geophysical Union for his article "The Case of the Missing Carbon." He is a generalist who has roamed throughout science during more than 20 years as an editor and writer for publications including Time-Life Books, Scientific American, The Sciences, Science, and most recently, U.S. News and World Report. During the first four of his eight years at Science, he edited and wrote news stories on physical sciences, working with staff writers and a large number of freelancers. Later he was responsible for coordinating Science's news and features on both biology and physical sciences. At U.S. News he wrote occasional stories on cosmology and physics for the science section while editing the magazine's health and medicine coverage.