Moreover, to generate optimum return on Bain's investment in its human resources, Tierney works hard to target "learning zealots" and to elevate them to key leadership positions. Tierney also sees the need to discard practices aimed at "maintaining our intellectual purity." Breaking out of the intellectual purity mindset has meant instituting nontraditional management policies. For example, in order to refresh learning throughout the Bain network, Tierney will rotate an office director from time to time, not as a disciplinary measure, but in the interests of keeping learning fresh and vital for both the individual and the team. According to this practice, the former office head usually returns to full-time client work. At Bain, rotating an office director is not seen as a demotion, but rather as a way of multiplying opportunities for learning. "Job rotation at this level," Tierney states, "keeps the office heads from getting stale. This way we can capitalize on the expertise of a seasoned officer and introduce into the position fresh, unpredictable insights.