He was one of the most beloved teachers in the world of international schools that serve the children of diplomats, well-off Americans and local elites. He was often the first to arrive in the morning, and last to leave. He led student trips to exotic places and gave out cookies and milk at bedtime.

That was the public persona of William Vahey until a maid stole a memory drive from him in November. It held evidence that Vahey had molested scores of adolescent boys, possibly more, during a four-decade teaching career.