Laurie Blass is a writer and editor specializing in print and digital English Language Teaching materials. She has an M.A. in Linguistics and a TESL certificate from the University of Pittsburgh and has taught ESL in the United States and France. She is the author/co-author of over 40 ELT titles representing a wide range of audiences, from adult education to English for academic purposes. Mari Vargo is an experienced writer, editor, and educational consultant based in San Francisco. She has written and developed a wide variety of print, online and multimedia products, for primary and secondary school, community college, adult school, and university students.