Mr. Gerstein served as a partner at Latham & Watkins LLP from 1996 until December 31, 2022, holding leadership positions, including global Chair of the Mergers & Acquisitions group, where he helped build the Latham & Watkins M&A Practice into a U.S. and global leader for public company transactions. He has counselled the directors and officers of Fortune 500 companies and other public companies on corporate governance, investor relations, crisis management, domestic and cross-border mergers and acquisitions, and other strategic and capital markets matters. From 1984 to 1996, Mr. Gerstein was a corporate partner at Katten Muchin Rosenman, an AmLaw 100 law firm, advising directors and owners of private and public companies on a variety of corporate matters. Since April 2023, Mr. Gerstein has served as a Senior Advisor to PJT Partners, a global, advisory-focused, investment bank. In addition, Mr. Gerstein was Chair and is currently a Board member of Youth Guidance, which works with children in urban public schools in Chicago and nationally. Mr. Gerstein also served as Co-Chair of the University of Michigan's Dean's Advisory Council at the School of Literature, Science and the Arts, and serves on the Executive Committee of The Ravinia Festival. Having served as a partner in the Mergers & Acquisitions group at Latham & Watkins, a leading global law firm, from 1996 until 2022, Mr. Gerstein brings the highest level of legal expertise and judgment to the Board. Mr. Gerstein possesses a deep understanding of the intricacies of corporate law and a tremendous knowledge of corporate governance best practices, both of which are key components of the Board's overall mix of skill sets. Through his many years of experience advising public companies on a wide array of domestic and cross-border mergers and acquisitions, Mr. Gerstein has developed a formidable ability to support and oversee management's execution on transactional opportunities for driving strategic growth. While serving more than a decade as a global Chair of Latham's M&A practice, Mr. Gerstein played a key role in building the firm's M&A practice into a U.S. and global leader, evidencing the value of his contribution to the Board's collective oversight of management's strategies for amplifying Omnicom's business. In his role as a senior law firm partner, Mr. Gerstein has provided critical guidance to many company boards regarding crisis management situations, an important facet of the Board's aggregation of skills. Mr. Gerstein also has extensive experience advising clients on investor relations and engagement, including on capital allocation matters, which contributes significantly to the Board's support and oversight of management's robust shareholder engagement efforts. With these many years of experience counselling the directors and officers of Fortune 500 companies and other public companies on a broad spectrum of legal and regulatory matters, Mr. Gerstein also possesses a sophisticated ability to gauge the legal and regulatory risks navigated by senior leadership of public companies such as Omnicom. Mr. Gerstein's extensive mergers and acquisitions and capital allocation experience is not only a tremendous asset for the Board, but is also particularly valuable to his service as a member of the Company's Finance Committee.