Administrative Office

22 South Market St., Ste. 6D
Frederick, MD 21701

Phone: 301-682-5683
Fax: 301-682-3499
Mobile Clinic Phone: 410-340-3791
Email: main@aMissionofMercy.org


Medical Team

Michael Sullivan, M.D. – Chief Medical Director
Roslyn Kellum, RN, DDS, Dental Director
Barbara Rebele, PA – Staff Clinician
Maureen Liddle, RN – Nursing Director
Errol Kellum, Dental Coordinator
Todd Orndorff and Bill Orndorff, Equipment Managers (job sharing)


Executive Administrative Staff

Linda Ryan
Executive Director

Jennifer White
Development Manager

Julie Wohlfarth
Development Assistant

Rachel Smith
Administrative Assistant