Members include representatives from the EAC Standards Board, EAC Board of Advisors, Architectural and Transportation Barriers Compliance Board, American National Standards Institute, The Institute of Electrical and Electronics Engineers, The National Association of State Election Directors (two representatives), and other individuals with technical and scientific expertise related to voting systems and voting equipment. 

The Help America Vote Act (HAVA) specifies the organizational membership of the TGDC, as follows:

The Director of the National Institute of Standards and Technology (NIST) serves as chair
2 members of the EAC Standards Board
2 members of the EAC Board of Advisors
2 members of the Architectural and Transportation Barrier, and Compliance Board (Access Board)
A representative of the American National Standards Institute (ANSI)
A representative of the (IEEE)
2 representatives of the National Association of State Election Directors (NASED)
4 individuals with technical and scientific expertise relating to voting systems and voting equipment.

The individuals comprising the TGDC are as follows: 

Chair
Patrick D. Gallagher
Deputy Director of the National Institute of Standards and Technology (NIST)
Gaithersburg, MD

EAC Standards Board - 2

Russ Ragsdale
City Clerk and Recorder
Broomfield, CO

Donald Palmer
Director, Division of Elections
Florida Department of State, Division of Elections
Tallahassee, FL 

EAC Board of Advisors - 2

Helen Purcell
Maricopa County Recorder
Phoenix, AZ

Linda Lamone
Administrator of Elections
Maryland State Board of Elections
Annapolis, MD

Architectural and Transportation Barrier Compliance Board (Access Board) - 2