The diversity of expertise on corporate boards in Australia

Expertise diversity is expected to enhance the monitoring and advising functions of boards of directors. Yet, little is known about the expertise that actually exists on corporate boards. In this study, we examine the diversity of professional expertise on corporate boards in Australia and implications for shareholder value. We categorise directors by 11 types of professional expertise and find the most common types of expertise are business executives, accountants, bankers, scientists, lawyers and engineers. We find that expertise diversity is primarily related to board size, industry and location. Our analysis also suggests that shareholders benefit when boards diversify their expertise within a subset of specialist business expertise (lawyers, accountants, consultants, bankers and outside CEOs). Further diversity beyond this subset of expertise is associated with lower firm value and performance.