Diana Hacker personally class-tested her handbooks with nearly four thousand students over thirty-five years at Prince George’s Community College in Maryland, where she was a member of the English faculty.  Nancy Sommers, who has taught composition and directed composition programs for thirty years, now teaches in Harvard’s Graduate School of Education. She led Harvard’s Expository Writing Program for twenty years, directing the first-year writing program and establishing Harvard’s WAC program. A two-time Braddock Award winner, Sommers is well known for her research and publications on student writing.