This sums it up well:
Tom was a man who labored in relative obscurity most of his life. He was not a great leader among men in the popular sense of the term. He wasn’t invited to speak around the country, the continent, or the world like his more well-known son. He was just an ordinary pastor who likely would have remained in obscurity had not his son offered us a glimpse into his father’s life. In doing so, Don Carson has written a book that should remind those who read it of Paul’s important charge regarding faithfulness—it is required of stewards that they be faithful or trustworthy (1 Cor. 4:2). The steward needs to carry out God’s charge without regard to personal gain or professional aggrandizement. Tom did, and therein is his legacy.