The recent troubles at Blackberry manufacturer
Research in Motion seem to suggest that dual leadership can be damaging for an organisation (
FT). But Rome had two consuls during its rise to dominance, and they were limited in their power to a tenure of one year.
Goldman Sachs in the late 1970s and early 1980s had co-chiefs - and that was when the firm laid the foundation to its rise to dominance. The challenge for boards and shareholders is to make sure there is a deep bench of talent - a thing that is sorely missing in many companies, why else would a company ever look for an external candidate for any of its top positions?