Gregory Stevens, MD is the founder of the original North Oakland practice and serves as the lead physician. The North Oakland practice is now part of Alliance Health Professionals. He has an extensive and diverse medical education, having completed studies at Central Michigan University, the University of Michigan, Wayne State University, and the American University of the Caribbean.

Dr. Tahki Jayasvasti is a board-certified Internal Medicine physician with a strong focus on preventive care and whole-person health. She earned her Bachelor of Science degree from the University of Michigan and completed medical school at the Chicago College of Osteopathic Medicine. Dr. Jayasvasti went on to complete her Internal Medicine residency at Mount Clemens General Hospital in Michigan.

Renee earned her Bachelor of Science in Nursing (BSN) from Oakland University in 1994 and her Master of Science in Nursing (MSN) from Wayne State University in 2001. She is a board-certified Adult Nurse Practitioner through the American Credentialing Center (ANCC). Renee has been caring for patients at Alliance North Oakland (formerly North Oakland internists) since 2001. Renee has additional clinical experience having worked with the neurosurgery team at Beaumont Hospital in Royal Oak Michigan, as well as the neurology team at Henry Ford Hospital in West Bloomfield. She went on to complete her Doctor of Nursing Practice (DNP) degree at Oakland University in 2014.

Tyler Ryman is a nationally certified Physician Assistant through the National Commission on Certification of Physician Assistants (NCCPA). He earned his Master of Physician Assistant Studies from Pennsylvania State University – University Park, Pennsylvania, in 2019.

Dr. Katherine Marston is a primary care physician specializing in Family Medicine. She earned both her undergraduate degree and Doctor of Osteopathic Medicine from Michigan State University. She completed her Family Medicine residency at Henry Ford Macomb Hospital.

Dr. Matthew J. Clune, D.O. grew up in Metro Detroit and earned his Bachelor of Science in Neuroscience from Michigan State University before graduating from the West Virginia School of Osteopathic Medicine. He went on to complete his Internal Medicine residency at Henry Ford St. John Hospital and is board certified in Internal Medicine by the American Board of Internal Medicine (ABIM).

Dr. Tammy L. West received her Bachelor’s degree from Eastern Michigan University, her Master’s degree from Waynes State University. She is born and raised in Michigan.

MaryBeth Kostiuk, DO, MPH is a board-certified family physician dedicated to providing compassionate, patient-centered care for every stage of life — from newborns to seniors. She partners with each patient to align care with their individual health goals, ensuring treatment is both personalized and effective.