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Medical Physicist Assistants Subcommittee (MPASC) AAPM Members, Affiliates and Non-Member Affiliates - Login for access to additional information Activities The Medical Physicist Assistants Subcommittee supports existing Medical Physicist Assistants (MPAs), as well as aiding in the transition of clinical professionals into the field by providing support and exposure to various informational resources regarding topics of particular interest to the MPA, including but not limited to: Encourage MPA volunteer participation in AAPM Encourage MPA participation in educational offerings Foster an MPA community Support the exploration for an MPA credentialing process By-Laws: Not Referenced.Rules: Not Referenced. Standing? This is not a standing committee. Approved Date(s): 7/1/2021 Committee Keywords: No Keywords Entered Board of Directors Professional Council Clinical Practice  [Status] Medical Physicist Assistants SC  [Status] » Conflict of Interest report for MPASC » Status Reports for Task Groups - AC | EC | IC | PC | SC | Board Committees | All

Chair Zhiyan Xiao 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= incomplete or out of date conflict of interest statement.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 4 voting members.

Chester R. Ramsey, PhD 8/1/2023 - 12/31/2026 Member	Jesiah Showers 10/1/2026 - 12/31/2029 Member
Christopher C. Smitherman 8/1/2023 - 12/31/2026 Member	Zhiyan Xiao, PhD 9/28/2026 - 12/31/2029 Subcommittee Chair

NON-VOTING Appointments

There are 0 non-voting members and guests.

HQ Team Appointed to Committee

There are 1 staff.

Nicholai Wingreen, BA 7/1/2021 - 12/31/2037 Programs Manager (ex officio, nonvoting)

See connections to Medical Physicist Assistants Subcommittee

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