Serving Chippewa, Luce, and Mackinac Counties

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Timothy Tetzlaff, D.O. Robert Mackie, M.D. John Ockenfels, D.O. Stethoscope

Dedicated medical professionals

At Riverside Medical Associates, we have a team of experienced, skilled physicians to provide you with the best care available. You can get major family practice services, including general medicine, pediatrics, geriatrics, obstetrics, and more.


Meet our team before your first visit so that you feel comfortable with us. You can either schedule an appointment or take advantage of our walk-in clinic. We've been in the business for 28 years!

Riverside Medical Associates: 906-632-1800

Riverside Medical After Hours: 906-632-1836


We have highly trained nurse practitioners available to see you at a moment's notice! After-hours care is available.

Contact Us

Timothy Tetzlaff, D.O.

Dr. Tetzlaff has cared for patients in the Eastern Upper Peninsula for over 2 decades. He considers it as a privilege to be involved in the lives of his patients and care for them.

Most insurance plans accepted, including Medicaid and Medicare

  • Undergraduate studies: Trent University in Peterborough, ONT, Canada

  • Medical School: Philadelphia (PA) College of Osteopathic Medicine

  • Internship and Residency: Martin Place Hospital in Madison Heights, MI

  • Board certified family physician with full hospital admitting privileges.

Robert Mackie, M.D.

For over 20 years, Dr. Robert Mackie has treated many patients while also motivating countless people to be proactive in their own healthy living practices.

  • Undergraduate studies: Albion (MI) College

  • Medical School: Wayne State University in Detroit, MI

  • Internship and Residency: Saginaw (MI) Cooperative Hospitals

  • Board certified family physician with full hospital admitting privileges.

John Ockenfels, D.O.

Dr. Ockenfels has been a partner in wellness with his patients since 1990. He firmly believes that the more informed his patients are the more they can participate in their own care.

  • Undergraduate studies: Brigham Young University in Provo, UT

  • Medical School: Michigan State University in East Lansing, MI

  • Internship: Flint (MI) Osteopathic Hospital

  • Residency: Sparrow Hospital in East Lansing, MI

  • Board certified family physician with full hospital admitting privileges.

Our nurse practitioners are highly trained and available to see patients at a moment’s notice.

  • Meghan Hanna, FNP-C

  • Terry Malloy, RN, FNP-C

  • Paula Nichols, FNP-C

Nurse Practitioners

John Ockenfels, D.O.