Richard A SpearsRichard A. Spears, Ph.D. is a former Professor of Linguistics at Northwestern University, and a highly respected lexicographer and author in the field of ESL reference.
Steven R. Kleinedler is a specialist in linguistics and lead autor of The American Heritage Science Dictionary. Betty J. Birner, Ph.D. is a professor at the Institute for Research in Cognitive Science at the University of Pennsylvania. Luc Nisset is an experienced illustrator and author of language learning materials. Read More Read Less
Betty J. Birner, Ph.D. is a professor at the Institute for Research in Cognitive Science at the University of Pennsylvania.
Luc Nisset is an experienced illustrator and author of language learning materials.
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