In addition to being Senior Minister, Dr. Ferguson is Professor of Systematic Theology at Westminster Theological Seminary. A graduate of the University of Aberdeen, Scotland, he is the author of some two dozen books, has authored numerous articles and has contributed to various symposia. His writing interests have ranged from works of scholarship to books for children. He has served as minister of two congregations in Scotland, one on Unst, the most northerly inhabited island in the United Kingdom, and the other at the center of Glasgow, the largest city in Scotland. He has served more than twenty years as a seminary professor and is currently on the faculty of Redeemer Seminary in Dallas, Texas as well as part time faculty of Westminster Seminary in Philadelphia.

Sinclair and his wife Dorothy have three sons, a daughter, three grandsons, and three granddaughters.