Lillian Theune, D.O. has lived and worked in Sussex/Warren counties since 1997.  She is board certified in Internal Medicine.  Dr. Theune earned her medical degree at Philadelphia College of Osteopathic Medicine and completed her internal medicine residency at Robert Wood Johnson University Hospital in New Brunswick, NJ.

She excels at taking care of adult patients with divers medical conditions, helping to coordinate specialists, overseeing multiple medication and monitoring all aspects of the patient’s care.

In her free time she loves hiking, Disney and traveling the world.