National Space-Based Positioning, Navigation, and Timing
Advisory Board

Membership, 2021-2023

All Advisory Board members were appointed to serve as either Special Government Employees (SGE's) or Representatives. SGE's and Representatives abide by different standards of ethical conduct.

Special Government Employees

SGE's are experts from industry or academia who temporarily receive federal employee status during Advisory Board meetings.

• Thad Allen (Chairman), Booz Allen Hamilton
• John Stenbit (Deputy Chairman - until 2022), former Assistant Secretary of Defense
• Bradford Parkinson (1st Vice Chair), Stanford University
• James E. Geringer (2nd Vice Chair), ESRI
• Penina Axelrad, University of Colorado
• John Betz, MITRE
• Scott Burgett, Garmin International
• Joseph D. Burns, The Airo Group
• Patrick Diamond, Diamond Consulting
• Dorota A. Grejner-Brzezinska, The Ohio State University
• Michael Hamel, Former Commander, Space and Missile Systems Center
• Larry James, Jet Propulsion Laboratory
• Vahid Madani, GridTology
• Jade Morton, University of Colorado
• Timothy A. Murphy, Boeing
• Tom Powell, Aerospace Corporation
• Eileen Reilly, Global Train Services
• T. Russell Shields, Ygomi LLC
• Gary W. Thompson, North Carolina Geodetic Survey
• Frank van Diggelen, Google
• Todd Walter, Stanford University
• Gregory D. Winfree, Texas A&M

Representatives

Representatives are individuals designated to speak on behalf of particular interest groups.

• Sonia Maria Alves Costa (until 2022), Brazilian Institute of Geography and Statistics (Brazil)
• Renato Filjar, University of Rijeka (Croatia)
• Dana Goward, Resilient Navigation and Timing Foundation
• J. David Grossman, Consumer Technology Association
• Matt Higgins, International GNSS Society (Australia)
• Terry Moore, University of Nottingham (UK)
• Jeffrey N. Shane, International Air Transportation Association

Executive Director

The membership of the Advisory Board is administered by a designated federal officer appointed by the NASA Administrator:

• James J. Miller, Executive Director

Subject Matter Experts

• Martin Faga, former CEO, The MITRE Corporation
• Kirk Lewis, Institute for Defense Analyses (IDA)
• Tom Powell, Aerospace
• Brian Ramsay, The MITRE Corporation

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