Compassion. Quality. Care. Multidisciplinary Expertise.

Our physician team and staff have extensive experience treating patients with stereotactic radiation therapy. Combined with highly advanced Novalis Tx® technology, San Diego Radiosurgery’s expert team delivers quality care in a compassionate manner.


  • Dr. Brian Volpp M.P.H

    Medical Director

    Brian Volpp, M.D., is a radiation oncologist at Palomar Health Downtown Campus, with a special interest in stereotactic body radiosurgery to extracranial sites as well as integrative medicine.

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  • Dr. Lori Coleman M.D.

    Radiation Oncologist

    Lori A. Coleman, M.D is the Medical Director of radiation oncology at Palomar Health Downtown Campus in Escondido, California.

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Medical Physicists

  • Mark Young

    Medical Physicist

    Mark is the Chief physicist at Palomar Health with over 20 years of experience. He has extensive radiosurgery experience utilizing Tomotherapy, Gamma Knife and Brainlab systems.

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  • Richard Seier M.S. D.A.B.R

    Medical Physicist

    Richard received a Bachelor of Science in Physics from Bloomsburg University in Pennsylvania, where he graduated Magna Cum Laude and received a Master of Science in Therapy Medical Physics from the University of Cincinnati in Ohio, where he graduated Summa Cum Laude.

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  • Thea McKenzie

    Patient Coordinator

    Thea has been employed by Palomar Health since 2012 and joined San Diego Radiosurgery in 2014.

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