If a successful analyst is hired by another organization, chances are both his work performance and the market value of his new company will not reap the expected benefits; they might even lose altitude. So discovered HBS professor Boris Groysberg and colleagues Ashish Nanda and Nitin Nohria, who detailed their results four years ago in the Harvard Business Review article, "The Risky Business of Hiring Stars." Since launching his research into the war for talent, however, Groysberg has started to notice something quite different about the career paths of successful analysts who were female. Star women, he found, maintained their shine even after switching companies. Unlike their male peers, they thrived in new work environments. Why the difference?