Doug Struck covered the Valdez oil spill for the Baltimore Sun and has reported frequently from the Arctic for The Washington Post during 30 years as a journalist. He has been a foreign and national correspondent reporting from six continents and 50 states, a Harvard Nieman fellow and Pulitzer Prize finalist. At The Washington Post, he specialized in global warming issues in assignments ranging from the Northwest Passage and Greenland to melting glaciers on the Andes Mountains. He now freelances and teaches journalism at Boston University.