In 2010, when David Nish was promoted from CFO to CEO at Standard Life, he knew the scale of the challenge his company faced. The 185-year-old giant had just embarked on a sweeping transformation from an insurer to a long-term savings and investment company. Nish also knew that as the person leading the change, he would be tested by decisions and management situations he hadn’t encountered in the past. Certain that he could benefit from the perspective of someone who had been down similar roads before, Nish turned to a somewhat unusual adviser: Niall FitzGerald, a former chairman of Unilever.

A version of this article appeared in the April 2015 issue (pp.100–103) of Harvard Business Review.