David S. Mack from the chest up
Recommended by: Nassau County Executive
Committee assignments: Bridges and Tunnels (Chair), Joint LIRR/MNR, Capital Program, Safety, Corporate Governance

David S. Mack is a senior partner of The Mack Company and a member of the Board of Directors of the Mack-Cali Realty Corp, a publicly traded Real Estate Investment Trust (REIT).

Mack serves as a member of the Board of Overseers of Northwell Health and is a former trustee of the North Shore Hospital, the Long Island Jewish Hospital System, and Pratt Institute. He also serves on the Boards of Trustees of Hofstra University and the Morse Health System, acting as Vice Chairman of both boards. Additionally, Mack is a member of the Board of Governors of the Palm Beach Country Club, where he is Vice Chairman of the admissions committee. His other board memberships include the Board of Directors of the Kravis Center; the Board of Trustees of the Town of Palm Beach United Way; membership in the Palm Healthcare Foundation; and the Board of the United Nation's Commission of New York State. 

Mack is also the 1st Assistant Commissioner of the Nassau County Police Department, 1st Vice President of the Palm Beach Police Foundation, and Undersheriff Executive Assistant for Governmental Affairs for Palm Beach County, Florida. Additionally, he served for 14 years, at the rank of Colonel, as Deputy Superintendent of the New York State Police.

Mack served previously on the MTA Board from December 1993 through September 2009, acting as Vice Chairman from 2001 to 2009. In addition, he was a member of the Board of Directors and Commissioner of the Port Authority of New York and New Jersey. 

Mack received his B.A. in business administration from Hofstra University.