Chair: Catharine Clark
Co-Chair: Jeorg Lehmann
Past-Chair: Stephen Kry
Steering Committee:

- European Organisation on Research and Treatment of Cancer – Radiation Oncology Group EORTC – ROG
- Dr Nicolaus Andratsehke (Radiation Oncologist)
- Dr Marianne Aznar (Medical Physicist)
- Dr. Coen Hurkmans (Medical Physicist)
- Marjolein Van Os (Radiation Therapist)

- Imaging and Radiation Oncology Core
- Dr. Stephen Kry (Medical Physicist)
- Dr. Ying Xiao (Medical Physicist)
- Dr. Paige Taylor (Medical Physicist)

- Japan Clinical Oncology Group – JCOG (in Japanese and English)
- Dr. Satoshi Ishikura (Radiation Oncologist)
- Dr. Mitsuhiro Nakamura (Medical Physicist)
- Dr. Satochi Kito (Medical Physicist)

- NCRI Radiotherapy Trials QA Group – RTTQA
- Prof Peter Hoskin (Radiation Oncologist)
- Dr. Catharine Clark (Medical Physicist)
- Mrs. Elizabeth Miles (Radiation Therapist)

- Trans-Tasman Radiation Oncology Group – TROG
- Dr. Martin Ebert (Medical Physicist)
- Dr. Annette Haworth (Medical Physicist)
- Dr. Tomas Kron (Medical Physicist)
- Dr. Jeorg Lehmann (Medical Physicist)
Members:

- CCTG Canadian Clinical Trials Group (Dr. Alan Nichol) – NCIC CTG
Observers:

- European Society for Therapeutic Radiation & Oncology (Dr. Tommy Knöös, Dr. Daniel Zips) – ESTRO

- International Atomic Energy Agency (Dr. Eduardo Zubizarreta, Dr. Elena Fidarova, Dr. Joanna Izewska) – IAEA

- Australian Clinical Dosimetry Service (Dr Jessica Lye) – ACDS
|