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Leadership Team


Todd Stivland, M.D.
Chief Executive Officer and Founder

Dr. Todd Stivland is the owner and CEO of Bluestone Physician Services. With more than 20 years’ experience as a family physician, Dr. Stivland is dedicated to changing the way health care is delivered.

From its founding in 2006, Bluestone grew from a small start-up to the largest on-site provider for assisted living communities in the country. In Bluestone Physician Services, Dr. Stivland created an innovative health care model for frail, chronically ill patients who need extensive medical and community services.

He is active in state and national health care reform and has served on the Minnesota governor’s health care finance task force. He is an active speaker on medical models and clinical practices.


  • Board-Certified, Family Medicine, University of Wisconsin-Madison, Wisconsin
  • Board-Certified, Hospice and Palliative Care
  • Doctor of Medicine, Mayo Medical School, Rochester, Minnesota
  • Bachelor of Arts, St. Olaf College, Northfield, Minnesota


Sarah Keenan, R.N.
Chief Clinical Officer
President, Bluestone Integrated Care

Sarah Keenan has worked with seniors in the health care industry for more than 20 years, providing community care expertise and implementing clinical programs that serve more than 10,000 people.

Keenan has been with Bluestone Physician Services since 2011, providing leadership within the Bluestone model of primary on-site patient care for people with disabilities. She designed, implemented and provided oversight to this model, which improves the quality and efficiency of primary care for people with disabilities living independently or in group home settings.

Keenan began her career as a registered nurse before becoming a director of nursing in long-term care. There, she worked with seniors as one of the first Medicare coordinators. Keenan also worked as a care coordinator for seniors insured by Medica, one of Minnesota’s largest health insurers.

She is published in medical home journals and speaks nationally on care coordination and preventative care in the Medicare population.


  • Bachelor of Science, Nursing, Montana State University, Bozeman, Montana


Tim Koehler, CPA
Chief Operating Officer
President, Bluestone National, LLC

Tim Koehler is COO of Bluestone Physician Services and President of Bluestone National. He is dedicated to expanding the Bluestone Physician Services model in the national health care market, improving the way medical care is delivered to vulnerable and high-risk patient populations.

Koehler’s 18-plus years at UnitedHealth Group included roles in executive leadership, operations, finance, sales, account management, acquisitions integration, new market strategy, personnel mentoring and development. Prior to joining Bluestone, he was one of the founders and president of the Diabetes Prevention and Control Alliance, a UnitedHealth Group organization.

Koehler’s focus throughout his career is improving the effectiveness and efficiency of healthcare, moving toward better and more sustainable systems that benefit both the individual patient and the community as a whole.


  •  Bachelor of Science, Business Administration, Ohio State University, Columbus, Ohio



David Nelsen, CPA
Chief Financial Officer

David Nelsen joined Bluestone Physician Services as CFO in 2017. He has extensive experience in the health care industry. Prior to Bluestone, he worked at American Dental Partners for 16 years, overseeing all financial operations and supporting the growth of the organization through both mergers and acquisitions activity and organic growth.

He also held a variety of finance positions at The Pillsbury Company and was an audit manager with KPMG.


  • Bachelor of Science, Accounting, Minnesota State University, Mankato, Minnesota
  • Certified Public Accountant (inactive status)


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