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Keystone Health

NwosuCaleb Nwosu, D.O.
Medical Director

Dr. Nwosu completed his residency at the Community Hospital of Lancaster in Lancaster, Pa.  He received his Doctorate of Osteopathy from Ohio University College of Osteopathic Medicine in Athens, OH.  Dr. Nwosu earned his Bachelor of Science degree from Cheyney University of Pennsylvania.


Norbert Mathias, M.D.


Dr. Mathias received his post-Doctoral training from York Hospital, in York, PA, and received his medical degree from Georgetown University. He received his undergraduate degree from Merrimack College, in North Andover, Massachusetts. Dr. Mathias is Board Certified by the American Board of Emergency Medicine.


Genia Greenland, CRNP


Ms. Greenland received her Master of Science in Nursing (M.S.N.)  from Penn State University, in State College, Pa., and a Bachelor of Science in Nursing (B.S.N) from Penn State University as well. Ms. Greenland obtained a Bachelor of Art in Political Science at Saint Leo College, in Tampa, FL.


Sara Leis, CRNP

Sara Leis- KUC

Ms. Leis received her Master of Science in Nursing (M.S.N.) at the University of Cincinnati, and a Bachelor of Science in Nursing (B.S.N) from the University of Phoenix. Ms. Leis obtained an Associates of Science in Nursing from Mount Aloysius College.



Shannon Fegan, PA-C

Physician Assistant

Ms. Fegan earned her Physician Assistant Bachelors Degree in Physician Assistant Sciences at Saint Francis University in Loretto, PA.

Certified Physician Assistant, Advanced Cardiac Life Support Provider, Basic Life Support Provider.