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Therapy Practice Accreditation Subcommittee (TPAS) AAPM Members, Affiliates and Non-Member Affiliates - Login for access to additional information Activities To coordinate AAPM activities with all therapy accrediting bodies. To work to ensure consistent modality-specific medical physics requirements across all accrediting bodies. To coordinate with the Government and Regulatory Affairs Committee (GRAC) to ensure consistent language in regulation and legislation as it applies to facility accreditation. Review requests for medical physics assistance from other groups relative to their practice or facility therapy accreditation programs. By-Laws: Not Referenced.Rules: Not Referenced. Standing? This is not a standing committee. Approved Date(s): n/a Committee Keywords: Acccreditation, ACR, ACRO, APEx, ASTRO, Practice Accreditation, TPAS Board of Directors Professional Council Clinical Practice  [Status] Therapy Practice Accreditation SC  [Status] » Conflict of Interest report for TPAS » Status Reports for Task Groups - AC | EC | IC | PC | SC | Board Committees | All

Chairs Prema Rassiah Subcommittee Chair Steven Sutlief Subcommittee Chair

2026 Roster

(dates shown below are start and end dates of position.)

= complete and up-to-date
= up-to-date but expires soon
= incomplete or out of date conflict of interest statement.

VOTING Appointments

There are 6 voting members.

Chunhui Han, PhD 3/30/2026 - 12/31/2028 Member	Anas Orfali, MS 2/12/2025 - 12/31/2027 Member
Prema Rassiah, PhD 2/12/2025 - 12/31/2027 Member 3/30/2026 - 12/31/2028 Subcommittee Chair	Zhong Su, PhD, MBA 3/30/2026 - 12/31/2028 Member
Steven G. Sutlief, PhD 1/1/2025 - 12/31/2027 Subcommittee Chair	Iris Z. Wang, PhD 2/12/2025 - 12/31/2027 Member

NON-VOTING Appointments

There are 3 non-voting members and guests.

Todd Bossenberger, MS 4/5/2022 - 12/31/2026 Liaison - APEx Representative (ex officio, nonvoting)	Nadeem Khan, MS, DHA 5/10/2022 - 12/31/2026 Liaison - ACRO Representative (ex officio, nonvoting)
Matthew Pacella, MS 4/5/2022 - 12/31/2026 Liaison - ACR Representative (ex officio, nonvoting)

HQ Team Appointed to Committee

There are 1 staff.

Nicholai Wingreen, BA 1/1/2019 - 12/31/2037 Programs Manager (nonvoting)

See connections to Therapy Practice Accreditation Subcommittee

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