Denise Wang felt settled in her life in London. She had a great job as the divisional marketing chief at a UK-based consumer goods company; a supportive husband, Phil, who was a partner in an international consultancy; and two daughters, eight and 10, who had for the previous three years attended the same school in their neighborhood. The family had good friends and an excellent au pair, and Phil’s Belgian parents were able to visit, and host them, frequently.

A version of this article appeared in the September 2015 issue (pp.108–110, 112) of Harvard Business Review.