August 25, 2011 – Chicago-headquartered executive search firm Heidrick & Struggles International has appointed Mark Nadler as partner in its leadership consulting practice. Mr. Nadler comes to Heidrick from Oliver Wyman Delta where he served as partner and specialized in consulting to CEOs, boards, and senior executives of major corporations on effective leadership and organizational change. Much of his work focused on CEO and C-level assessment and succession planning. "We are thrilled at Mark's arrival, especially now, when global business leaders are primed for our advice and counsel during this challenging economic climate," said Rick Greene, Americas regional managing partner, leadership consulting. Heidrick & Struggles is a provider of senior-level executive search and leadership advisory services, including succession planning, executive assessment, talent retention management, executive development, transition consulting for newly appointed executives, and M&A human capital integration consulting.