Richard A. Spears
Richard 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 author of The Americ
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Richard 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 author 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.
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