Carol Ann Tomlinson's career as an educator includes 21 years as a public school teacher of a differentiated classroom. Her work included 12 years as a program administrator of special services for struggling and advanced learners. She was Virginia's Teacher of the Year in 1974. More recently, she has been a faculty member at the University of Virginia's Curry School of Education, where she is currently professor of educational leadership, foundations, and policy, and codirector of the university's Summer Institute on Academic Diversity and Best Practices Institutes, and where she was named Outstanding Professor in 2004. Tomlinson is the author of more than 200 articles, book chapters, books, and other professional development materials. For ASCD, she has written seven books, including How to Differentiate Instruction in Mixed-Ability Classrooms, The Differentiated Classroom: Responding to the Needs of All Learners, and Fulfilling the Promise of the Differentiated Classroom: Strategies and Tools for Responsive Teaching, and with Jay McTighe she wrote Integrating Differentiated Instruction and Understanding by Design: Connecting Content and Kids. Tomlinson's ASCD books have been translated into 12 languages. For Corwin Press, she coauthored The Parallel Curriculum Model: A Design to Develop High Potential and Challenge High-Ability Learners. For the National Middle School Association, with Kristi Doubet she wrote Smart in the Middle Grades: Classrooms That Work for Bright Middle Schoolers. She works nationally and internationally with teachers and administrators who want to develop classrooms and schools that are actively responsive to academically diverse student populations. Tomlinson can be reached at the University of Virginia, P.O. Box 400277, Charlottesville, VA 22904, or via e-mail at cat3y@virginia.edu.

Kay Brimijoin is currently associate professor of education and chair of the Education Department at Sweet Briar College in central Virginia, where since 2000 she has taught in the teacher education program and helped to launch a master's program in differentiated curriculum and instruction. More than 20 years of classroom teaching and school administration, doctoral research on differentiation, and more than 10 years of work with schools and school districts convinced Brimijoin that teacher education programs must equip new teachers with the knowledge, understanding, and skills to differentiate curriculum and instruction. She completed her PhD in educational psychology with a concentration in curriculum and instruction and gifted education at the University of Virginia. She won a High School Curriculum Award (1999), a Research and Evaluation Award (2000), and a Doctoral Student Award (2002) from the National Association for Gifted Children. She also won a Doctoral Dissertation Research Award from the Virginia Association for Supervision and Curriculum Development in 2001. She coauthored a unit in Carol Ann Tomlinson and Cindy Strickland's Differentiation in Practice: Grades 9–12, published by ASCD in 2005. Brimijoin is the author of numerous articles, including a 2003 review of the literature supporting differentiation. She has written curriculum with elementary, middle, and high school teachers and presented at numerous local, state, and national conferences. She consults with schools and districts across the country on differentiation, curriculum design, gifted education, mentoring, and teacher education. Brimijoin can be reached at Sweet Briar College, Sweet Briar, VA 24595, or via e-mail at brimijoin@sbc.edu.

Lane Narvaez has been the principal at Conway Elementary in the Ladue School District, St. Louis, Missouri, for the past 12 years. She has served as an administrator at the elementary, middle, high school, and district levels. Narvaez has worked in the public school systems of New York, Arizona, and Missouri, and has 28 years of teaching and administrative experience. She has worked in at-risk as well as affluent school communities. Her degrees include a bachelor of arts from Hunter College in New York, a master's in reading from Manhattan College in New York, and a doctorate in reading from Arizona State University. Her research interests include mentoring the beginning teacher, curriculum and instruction, and schoolwide differentiation. She has presented at the national conferences of the Association of Teacher Educators, American Educational Research Association, and the Association for Supervision and Curriculum Development. She has also presented at the Summer Institute of Academic Diversity at the University of Virginia and the Oxford Round Table in Oxford, England, on her work involving schoolwide differentiation. For the past three years she has worked with Henry County Schools in Virginia to help implement differentiation throughout the district's schools. She has served as a coach in differentiation for schools in Virginia and California, working with teachers and administrators as they implement differentiation. Narvaez can be reached at Conway Elementary School, 9900 Conway Road, School District of the City of Ladue, St. Louis, MO 63124, or via e-mail at lnarvaez@ladue.k12.mo.us.