The Editors of the American Heritage Dictionaries are a team of professional lexicographers with advanced degrees in various scholarly fields. The editors familiarize themselves with the vocabulary in specific subject areas, collect materials on new developments and usage, and work with expert consultants to ensure that the content of our publications is as accurate and as up-to-date as possible.
Though not as extensive - or as scholarly - as Merriam Webster's "English Usage Dictionary," this little book has often helped me explain thorny contemporary usage problems to my advanced ESL students. For example, a student came to me with the lyrics "Hadn't a been for..." and asked me to explain the usage of "hadn't have." None of my other books addressed this issue. (If you're not sure, see page 39.)