Christina Tree launched the Explorer's Guide series more than 30 years ago. She is a regular contributor to Yankee Magazine and has been honored by the Maine Publicity Bureau and the New England Innkeepers Association. Tree travels thousands of miles every year doing research to revise her books. She lives in Cambridge, MA. Christine Hamm, a longtime NH resident, has written for the Concord (NH) Monitor and the New York Post. Hamm lives in Hopkinton, NH. Katherine Imbrie has been a Providence Journal feature writer for over 20 years.