Matthew Leffingwell

( Federal )
Clients

1) ABBOTT LABORATORIES

2) AIRBUS AMERICAS, INC.

3) ALTANA TECHNOLOGIES

4) AMERICAN PROPERTY CASUALTY INSURANCE ASSOCIATION

5) CHESAPEAKE CLIMATE ACTION NETWORK

6) COALITION FOR INTERNATIONAL BROADCASTING

7) DELOITTE LLP

8) ENVIRONMENTAL DEFENSE ACTION FUND

9) EOS ENERGY ENTERPRISES LLC (FKA EOS ENERGY STORAGE LLC)

10) FINSECA

11) FRIENDS OF THE GLOBAL FIGHT AGAINST AIDS, TUBERCULOSIS, AND MALARIA

12) GILEAD SCIENCES, INC.

13) GIVEDIRECTLY

14) INTERNATIONAL SOCIETY OF OPTICS AND PHOTONICS

15) JAZZ PHARMACEUTICALS

16) MALARIA NO MORE

17) MICROSOFT CORPORATION

18) MISSISSIPPI COUNTY, ARKANSAS

19) MONKTON, INC.

20) ORGANON, LLC

21) PHLOW CORPORATION

22) SECURE IDENTITY, LLC (DBA CLEAR)

Last Updated: July 21, 2026