Senior Advisors


James McCann
Mr. McCann served as Chairman and Chief Executive Officer of, Inc., a florist and gift company, from 1976 until June 2016. Since June 2016, he has served solely as an executive chairman of that company. Mr. McCann has served as the Chairman of the board of directors of Willis Towers Watson since January 2016. Previously, he served as a director of Willis Group Holdings; as non-executive Chairman of Willis’ board of directors; Chairman of Willis’ Governance Committee; and as a member of its Executive Committee. Mr. McCann serves as a director on the boards of Scott’s Miracle-Gro and International Game Technology PLC. Mr. McCann holds a Bachelor of Arts degree in Psychology from John Jay College of Criminal Justice.

Jeffrey Sonnenfeld
Mr. Sonnenfeld is Senior Associate Dean for Executive Programs and Lester Crown Professor in the Practice of Management at Yale School of Management, where he has taught since 1999. Before joining Yale, he taught for ten years as a professor at Harvard Business School and nine years as a professor at Emory University’s Goizueta Business School. Mr. Sonnenfeld is the founder of Chief Executive Leadership Institute, a non-profit educational and research institute focused on CEO leadership and corporate governance, and the world's first school for chief executives. Mr. Sonnenfeld has served on the editorial boards of several journals, and his professional activities also include membership on various non-profit organization and public company boards. Mr. Sonnenfeld was listed by Business Week as one of the “ten B-school professors who are influencing contemporary business thinking” and one of the “100 most influential players in corporate governance” by National Association of Corporate Director’s Directorship. 

Ambassador Louis Susman
Ambassador Susman is an American lawyer, retired investment banker and the former United States Ambassador to the United Kingdom. Prior to his appointment, Ambassador Susman was the Managing Director and Vice Chairman of Citigroup Corporate and Investment Banking. He practiced law for 27 years and was a Senior Partner at the St. Louis-based law firm of Thompson & Mitchell, focusing on mergers and acquisitions and general corporate law. Ambassador Susman was appointed to the U.S. Advisory Commission on Public Diplomacy in 1988, and served as a Director of the Center for National Policy in Washington, D.C. He retired in 2009 as Vice Chairman of Citigroup Global Markets in Chicago. Ambassador Susman is a member of the Secretary of State’s Foreign Affairs Policy Board.  He is a graduate of the University of Michigan and earned his law degree from Washington University in St. Louis

Larry Summers
Mr. Summers is President Emeritus of Harvard University. During the past two decades he has served in a series of senior policy positions, including Vice President of development economics and chief economist of the World Bank, Undersecretary of the Treasury for International Affairs, Director of the National Economic Council for the Obama Administration from 2009 to 2011, and 71st Secretary of the Treasury for President Clinton from 1999 to 2001. He received a Bachelor of Science degree from the Massachusetts Institute of Technology in 1975 and was awarded a Ph.D. degree from Harvard in 1982. In 1983, he became one of the youngest individuals in recent history to be named as a tenured member of the Harvard University faculty. In 1993, he was awarded the John Bates Clark Medal, given every two years to the outstanding American economist under the age of 40. He is currently the Charles W. Eliot University Professor at Harvard University.

The Senior Advisors listed are independent professionals who work with Atlas and our portfolio companies to provide industry and operating expertise, and access to relationships that enhance our ability to serve our portfolio companies and investors. While not employees of Atlas, these professionals have a strong professional connection with the firm.