Don has a B.S. in missiological studies, Nyack College; an
M.A. in Teaching English as a Second Language, New York University; and a
Ph.D. in Linguistics, New York University.
He taught in and directed ESL programs for 50 years, and linguistics for about half of those years.
His published books include Intensive Course in American English Grammar, Series I (Prelim. Ed.), co-editor. American Language Institute, New York University (1964),
Modifying English as a Second Language Materials, and Placement Guide; University of State of New York (1975), and
The Language Gap. [on the uniqueness of human language] Zondervan, Probe Ministries (1984). He has served as a teaching elder for many years.