| Visiting Professor | Baltic Reformed Theological Seminary, Riga, Latvia | |
| Recd. by | PMW, OPC | |
| Professor | of Church History and Libr., Covenant Theological Seminary | 1968–1989 |
| Professor of Ch. Hist. and Librarian | Covenant Theological Seminary | 1968–1989 |
| Visiting Professor | Korea Theological Seminary, Pusan, Korea | 1978 |
| pastoral staff | Coral Ridge PCA, Ft. Lauderdale, FL | 1989–1994 |
| Professor | Church History and Libr., Knox Theological Seminary | 1989–1994 |
| Professor | Knox Theological Seminary | 1989–1994 |
| Visiting Professor | Presbyterian Theological Seminary, Dehra | 1993 |
| Professor | Church History and Libr., Mid-America Reformed Seminary | 1994–1999 |
| Professor | Mid-America Reformed Seminary | 1994–1999 |
| Associate Pastor | Covenant PCA, Hammond, IN | 1997–2000 |
| International Theological Education Min. | board member | 1999–2011 |