Douglas P. Sieminski, D.O.


Dr. Sieminski graduated from New York College of Osteopathic Medicine, Old Westbury, New York, in May 2003.  He completed his residency training in Family Practice in June 2006 at Union Hospital (Affiliate of St. Barnabas Health Care System), Union, New Jersey, where he was the Chief Resident from 2004 to 2006.  He also completed his internship at Union Hospital in June 2004.  Dr. Sieminski attended Drew University, Madison, New Jersey, where he received a Bachelor of Arts Degree in Biology in May 1999. 

Dr. Sieminski is Board Certified in Family Practice through the American Board of Osteopathic Family Physicians.  He is a member of the American Osteopathic Association, American College of Osteopathic Family Practitioners, and New Jersey Association of Osteopathic Physicians and Surgeons.


Dr. Sieminski currently provides patient care at our Andover, New Jersey office.

Jennifer E. Horn, D.O.


Dr. Horn graduated from the University of Medicine and Dentistry of New Jersey, School of Osteopathic Medicine in Stratford, New Jersey in 1998. She completed her residency training in Family Practice in 2001 at Our Lady of Lourdes Medical Center in Camden, New Jersey. Dr. Horn attended The College of New Jersey in Trenton, where she received a Bachelors Degree in Biology in May 1992. 

Dr. Horn was a Major in the United States Air Force, Pope Air Force Base in North Carolina from October 2001 thru October 2005, where she managed the clinic’s largest panel.  She provided care to 12,400 patients.

Dr. Horn is Board Certified in Family Practice by the American Osteopathic Board of Family Physicians.

 Dr. Horn has staff privileges in the Department of Family Practice at Saint Clare’s Hospital, 25 Pocono Road, Denville, New Jersey and Newton Memorial Hospital, 175 High Street, Newton, NJ 07860.   She currently provides patient care at our Andover, New Jersey office.

Andover Providers

Robert J. Pampin, D.O.


Robert J. Pampin, D.O., graduated from the New York College of Osteopathic Medicine, Old Westbury, New York, in June 1991.  He completed his residency training in Family Practice in June 1994 at St. Joseph’s Hospital and Medical Center, Paterson, New Jersey.  He completed his internship at St. Barnabas Hospital, Bronx, New York, in June 1992. 

Dr. Pampin attended St. John’s University, Jamaica, New York, where he earned a Bachelor of Science Degree in Pathology in June 1984 and received a Master of Science Degree in Toxicology in June 1991.  In June 1981 he graduated from Rockland Community College, Suffern, New York, with an Associate of Applied Science Degree.

Dr. Pampin is Board Certified in Family Practice through the American Academy of Family Practice.  He is member of the American Academy of Family Practice and the American Osteopathic Association.

Dr. Pampin has staff privileges in the Department of Family Practice at Newton Memorial Hospital, 175 High Street, Newton, New Jersey.  He currently provides patient care at our Andover, New Jersey office.