Supporting and Growing Independent Medicine


Steve Kros, MBA

Chief Executive Officer

Kros joined OneHealth in May 2017. He previously served in a variety of executive management positions in finance, strategic planning and mergers and acquisitions with First Data Corporation and West Corporation. Kros received his master’s and bachelor’s degrees in business administration from the University of Nebraska.

Bob Rauner, MD, MPH

Chief Medical Officer

Dr. Rauner joined OneHealth in January 2017. He previously was Chief Medical Officer for SERPA ACO in Nebraska, served on the faculty of the Lincoln Family Medicine Program and was a family doctor is in his hometown of Sidney, Nebraska. Dr. Rauner has a master’s degree in public health from Johns Hopkins University and is a graduate of the University of Nebraska Medical Center College of Medicine and Creighton University.

Donna Mertz, LPN, CPC

Vice President of Clinical Integration

Mertz joined OneHealth in June 2017. She is a Licensed Practical Nurse and a Certified Professional Coder. Mertz previously served in a variety of senior management roles at CHI St. Elizabeth’s, most recently as the Director of Operations for The Physicians Network.

Rhiannon Marshall, MBA

Vice President of Finance and Operations

Marshall joined OneHealth in August 2017. She previously worked in a variety of finance and accounting positions at Rockwell Collins. Marshall received her master’s and bachelor’s degrees in business administration from the University of Iowa.


  • OneHealth Nebraska
  • 4600 Valley Road, Suite 400
  • Lincoln NE 68510



An independent physicians association dedicated to supporting and growing independent medicine in Lincoln, Crete, Auburn, Hastings and Grand Island.