Research by Professor Boris Groysberg and colleagues shows that male and female board members have very different takes on the issue.

FORBES: A Focus on Gender Issues in the Workplace

Boris Groysberg, Professor of Business Administration at Harvard Business School, found that male stars who were hired away by another firm suffered nearly a one percent performance drop after moving.

FORBES: The Debate Continues: Do You Prefer Superstar Individuals or Effective Teams?

This was underlined by a study of star security analysts in American investment banks in 1988-96, conducted by Boris Groysberg of Harvard Business School and Ashish Nanda of Harvard Law School.

ECONOMIST: Masters of the universe

In his paper, Bidwell references the work of Harvard Business School professor Boris Groysberg, who published a well-received book two years ago about what happens to star investment analysts when they switch firms.

FORBES: Why Promoting From Within Usually Beats Hiring From Outside