[1] Previously, he taught at West Virginia University and Huntingdon College (Montgomery, Alabama), and in the Mississippi public schools.

Worldwide, he has been a dissertation and thesis advisor, committee member, and external reviewer for institutions in Australia, Eastern and Western Europe, and North and South America.

Altogether, he has advised 44 doctoral dissertations and two master's theses, including several university and national award winners.

[1]: TEACHING Humphreys has more than 175 publications and translations in nine languages (Arabic, Bulgarian, Bosnian/Croatian/Serbian, English, Greek, Macedonian, Mandarin, Spanish, Turkish), including chapters and articles in books and journals,[4] the Grove Dictionary of American Music, and Sage Directions in Educational Psychology—a republication of works by leading scholars in educational psychology and measurement (e.g., Bruner, Chronbach, Glaser, Nunnally, Piaget, Rogers, Stanley, Robert Thorndike).

He has collaborated with the Morrison Institute for Public Policy and the U.S. National Endowment for the Arts (consultant); Greek Ministry of Education, European Union, and U.S. National Endowment for the Humanities (member of research teams); and Social Sciences and Humanities Research Council of Canada and the U.S. Fulbright Specialist Program, World Learning (reviewer).

He has participated in dozens of other HFH projects, including a Global Village build in Belfast, Northern Ireland.