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.

Brandon Webb, MD

Medical Director

Dr. Webb joined OneHealth in January of 2022. In addition to his OneHealth role, Dr. Webb is a practicing partner at South Lincoln Family Physicians and has privileges at St. Elizabeth Hospital and Bryan Health System in Lincoln, Nebraska. Dr. Webb is board-certified in Family Medicine and holds medical licenses in Nebraska and Texas. Dr. Webb is a graduate of Baylor University with a Bachelor of Science degree and received his Doctor of Medicine degree from the University of Texas at Houston Medical School. Before moving to Nebraska, Dr. Webb served as chief resident and completed his residency at Memorial Hermann Hospital Southwest in Houston, Texas.

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.

Emily Panowicz

Director of Membership Services and Communications

Panowicz joined OneHealth in May 2022. She started at OneHealth as an intern and then transitioned to full-time in May 2023. Panowicz received her bachelor’s degree in business administration from Nebraska Wesleyan University.


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



An independent physicians association dedicated to supporting and growing independent medicine in Lincoln, Grand Island, Crete, Auburn, Hastings, Bellevue, Holdrege, Kearney and North Platte.