Dr. Popal has trained ESL/EFL teachers in English and Applied Linguistics across Afghanistan, Pakistan, Korea, China, and Germany since 1980. He has been an integral faculty member in the USF School of Education IME Department, particularly the MATESOL program, since 1993. His published research in bilingual education, linguistic code-switching and code-mixing has contributed significantly to scholarship in his field.
He is regularly invited as a featured speaker at national and international conferences such as TESOL, CATESOL, NABE, and CABE. Recognition of his teaching includes Outstanding Educator Award at USF, Teacher of the Year Award at the College of Alameda, and Honored Instructor at the University of California, Berkeley. He also serves on the advisory board for St. Mary's College's Graduate TESOL program and UC Berkeley’s TESL Certificate Program.
- EdD, Education (Linguistics emphasis), University of San Francisco
- Advisory Board member, Graduate TESOL program, St. Mary's College
- Advisory Board member, TESL certificate program, University of California, Berkeley
- Teaching cognitive and social theories of linguistics