To Sir, with Love, 1967. Sidney Poitier stars as Mark Thackeray, an engineer by training who reluctantly takes a teaching job in a working-class London high school. His unruly students (played by an impressive group of unknowns) assume they'll easily gain the upper hand. Poitier, of course, has other ideas. Eventually he wins the students over, changing their lives, and his, in the process.