Our Team

The board-certified radiation oncologists at ROC provide a full complement of radiation services. Committed to compassionate, ethical, and leading-edge cancer care, our physicians will review your treatment plan in detail, collaborate and communicate with your healthcare team and provide treatment in a supportive environment.

Meet the team at Radiation Oncology Centers:

  • Eric Buth, MD

    Board-Certification: Radiation Oncology, American Board of Radiology
    Residency: Henry Ford Hospital, Detroit, Michigan
    Internship: Spectrum Health, Butterworth Campus, Grand Rapids,  Michigan
    Medical School: Michigan State University College of Medicine, East Lansing, Michigan
    Memberships: ASTRO, ACRO, COG (Children’s Oncology Group)

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  • Patrick Fabrizio, MD

    Board-Certification: Radiation Oncology (American Board of Radiology)
    Residency: Mayo Clinic, Rochester, MN
    Internship: William Beaumont Hospital, Royal Oak, MI
    Medical School: University of Michigan, Ann Arbor, MI
    Undergraduate: Michigan State University, East Lansing, MI
    Memberships: ASTRO

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  • Brian Kastner, MD

    Board-Certification: Radiation Oncology (American Board of Radiology)
    Residency: Mayo Clinic, Rochester, MN
    Internship: Good Samaritan Hospital, Phoenix, AZ
    Medical School: Kansas University Medical Center, Kansas City, KS
    Undergraduate: Southern Methodist University, Dallas TX
    Memberships: ASTRO

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  • R. Spencer Kirkland, MD

    Board-Certification: Radiation Oncology (American Board of Radiology)
    Residency: University of Alabama at Birmingham (UAB), Birmingham, AL
    Internship: Resurrection Medical Center, Chicago, IL
    Medical School: University of Missouri, Columbia, MO
    Undergraduate: Furman University, Greenville, SC
    Memberships: ACRO

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  • Michael Mahacek, MD

    Board-Certification: Radiation Oncology (American Board of Radiology)
    Residency    : The University of Michigan Medical Center, Ann Arbor, MI
    Internship: Butterworth Hospital, Grand Rapids, MI
    Medical School: Michigan State University College of Human Medicine, East Lansing Michigan
    Graduate school (MS): The University of Michigan, Ann Arbor, MI
    Undergraduate: The University of Michigan, Ann Arbor, MI
    Memberships: ASTRO, ACRO, ACR, COG (Children’s Oncology Group), KCMS, and MRS

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  • Matthew Packard, MD

    Board-Certification: Radiation Oncology (American Board of Radiology)
    Residency: Allegheny Health Network, Pittsburgh, PA
    Internship: University of Pittsburgh Medical Center - Mercy, Pittsburgh, PA
    MD: University of Toledo College of Medicine, Toledo, OH
    Undergraduate: Dickinson College, Carlisle, PA
    Memberships: ASTRO, ACR, ACRO

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  • Gina Rebesco, MD

    Board-Certification: Radiation Oncology (American Board of Radiology – Board Certified) 
     Residency: University of Alabama at Birmingham (UAB), Birmingham, AL
     Internship: Indiana University Transitional Year, Indianapolis, IN
     Medical School: Indiana University School of Medicine, Indianapolis, IN
     Undergraduate: University of Notre Dame, Notre Dame, IN
     Memberships: ASTRO, ACRO

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  • Paul Thieme, DO

    Board Certification: Radiation Oncology (American Board of Radiology)
    Fellowship: Henry Ford Hospital, Detroit, MI
    Residency: Henry Ford Hospital, Detroit, MI
    Internship: Detroit Osteopathic Hospital, Detroit, MI
    Medical School: Michigan State University College of Osteopathic Medicine, East Lansing, MI
    Undergraduate: Michigan State University, East Lansing, MI
    Memberships: ASTRO, ASCO, RSNA, AMA, ACR

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