Robert D. Timmerman, M.D., FASTRO, FACR, is Professor and Chair of Radiation Oncology, Professor of Neurosurgery, and Effie Marie Cain Distinguished Chair in Cancer Therapy Research. His primary practice involves the treatment of adult and children with brain tumors.

Dr. Timmerman graduated from Iowa State University with a bachelor's degree in nuclear engineering and a master's degree in reactor physics from the University of Tennessee. After finishing medical school in his home state of South Dakota, he completed a residency in radiation oncology at The Johns Hopkins Hospital. He was the principal investigator or co-investigator on several prospective trials designed to evaluate the efficacy and toxicity of stereotactic body radiation therapy in lung, liver, spine, and pelvic sites. He is the national principal investigator of Radiation Therapy Oncology Group (RTOG) trials using this therapy in patients with early stage lung cancer.


Other Post Graduate Training
University of Tennessee at Knoxville (1986)
Graduate School
University of Tennessee at Knoxville (1986)
Medical School
University of South Dakota (1990)
McKennan Hospital (1991), Transitional Year
Johns Hopkins School of Medicine (1994), Radiation Oncology

Research Interest

  • Effect of SAbR on immune function and immunotherapy
  • Hypofractionated Radiation Therapy
  • Radiation Response Modifiers
  • Stereotactic Body Radiation Therapy


Where Does Auto-Segmentation for Brain Metastases Radiosurgery Stand Today?
Kim M, Wang JY, Lu W, Jiang H, Stojadinovic S, Wardak Z, Dan T, Timmerman R, Wang L, Chuang C, Szalkowski G, Liu L, Pollom E, Rahimy E, Soltys S, Chen M, Gu X Bioengineering 2024 May 11
Stereotactic radiosurgery in the management of non–small cell lung cancer brain metastases: a prospective study using the NeuroPoint Alliance Stereotactic Radiosurgery Registry
Michalopoulos GD, Katsos K, Grills IS, Warnick RE, McInerney J, Attia A, Timmerman R, Chang E, Andrews DW, D’Ambrosio AL, Cobb WS, Pouratian N, Spalding AC, Walter K, Jensen RL, Bydon M, Asher AL, Sheehan JP Journal of neurosurgery 2024 May 140 1223-1232
An AI-based approach for modeling the synergy between radiotherapy and immunotherapy
Peng H, Moore C, Zhang Y, Saha D, Jiang S, Timmerman R Scientific reports 2024 Apr 14 8250
BIOGUIDE-X: A First-in-Human Study of the Performance of Positron Emission Tomography-Guided Radiation Therapy
Vitzthum LK, Surucu M, Gensheimer MF, Kovalchuk N, Han B, Pham D, Chang D, Shirvani SM, Aksoy D, Maniyedath A, Narayanan M, Da Silva AJ, Mazin S, Feghali KA, Iyengar P, Dan T, Pompos A, Timmerman R, Öz O, Cai B, Garant A International Journal of Radiation Oncology Biology Physics 2024 Apr 118 1172-1180
Stereotactic ablative radiotherapy for primary renal cell carcinoma
Yang DX, Kwon YS, Timmerman R, Hannan R Clinical and Translational Radiation Oncology 2024 Jan 44
Beyond conventional bounds: Surpassing system limits for stereotactic ablative (SAbR) lung radiotherapy using CBCT-based adaptive planning system
Gonzalez Y, Visak J, Overman L, Liao CY, Yen A, Zhuang T, Cai B, Godley A, Zhang Y, Timmerman R, Iyengar P, Westover K, Parsons D, Lin MH Journal of applied clinical medical physics 2024
Integrating local and distant radiation-induced lung injury: Development and validation of a predictive model for ventilation loss
Vicente EM, Grande Gutierrez N, Oakes JM, Cammin J, Gopal A, Kipritidis J, Modiri A, Mossahebi S, Mohindra P, Citron WK, Matuszak MM, Timmerman R, Sawant A Medical physics 2024
Optimizing Risk Vs. Reward in the Era of Ablative Radiotherapy Through Calculated Useful Trauma (CUT)
Sanford NN, Timmerman RD International Journal of Radiation Oncology Biology Physics 2024 119 721-723
Rethinking the potential role of dose painting in personalized ultra-fractionated stereotactic adaptive radiotherapy
Peng H, Deng J, Jiang S, Timmerman R Frontiers in Oncology 2024 14
Modeling gamma knife radiosurgical toxicity for multiple brain metastases
Hsu EJ, Yan Y, Timmerman RD, Wardak Z, Dan TD, Patel TR, Vo D, Stojadinovic S Radiotherapy and Oncology 2023 Nov 188


Featured Books Legend Featured Books

Stereotactic Body Radiation Therapy

Brian Kavanagh and Robert Timmerman (Ed.) (2005). Baltimore, MD, Lippincott, Williams, and Wilkins

Image Guided and Adaptive Radiation Therapy

Robert Timmerman and Lei Xing (Ed.) (2009). Baltimore, MD, Lippincott, Williams, and Wilkins

Treating Tumors that Move with Respiration

Urschel HC, Luketich JD, Papiez L, Timmerman R (Ed.) (2007). New York, NY, Springer Science & Business Media

IMRT, IGRT, SBRT - Advances in the Treatment Planning and Delivery of Radiotherapy

Meyer J, Kavanagh B, Timmerman R (editors) (Ed.) (2007). Basal, Switzerland, Karger

Honors & Awards

  • Alpha Omega Alpha
    1989 (0)
  • The Best Doctors in America
    1998-2005 (0)

Professional Associations/Affiliations

  • American College of Radiology
  • American Society for Therapeutic Radiology and Oncology
  • Radiation Therapy Oncology Group
  • Society for Neuro-Oncology
  • The Children′s Cancer Group and The Children′s Oncology Group