Researchers are running correlations on CEOs' personal life to their performance. We have studies on CEOs buying large houses and CEOs frequency on the front page of business magazines (there are negative correlations to performance on both). The latest is a study on family deaths. CEOs that have suffered the death of a child (or spouse) belong to companies that underperform the market (the death of an in-law correlates to market overperformance).
From the Business Law Prof Blog.