Meet Our Team

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David Christiansen, M.D., Medical Director

David Christiansen, M.D., Medical DirectorDr. Christiansen received his Medical Degree from the Medical College of Virginia in Richmond. He completed his residency at Albany Medical Center Hospital and also M.S. Hersey Medical Center. Dr. Christiansen has been working in Emergency Medicine since 1979. He came to Hunterdon Medical Center in 1990 and began working in the Emergency Department. He is currently the Medical Director for Occupational Health services at Hunterdon Medical Center and has served in this role since 1996. Dr. Christiansen is board certified in Emergency Medicine.

John Siekierka, D.O.

John Siekierka
Dr. Siekierka graduated with a Doctor of Osteopathic Medicine from The Philadelphia College of Osteopathic Medicine. He completed his residency training at Metropolitan Hospital-Parkview Division in Philadelphia and Delaware Valley Medical Center in Langhorne, PA. He has been working in Emergency Medicine since 1992 and is board certified by The American Osteopathic Board of Emergency Medicine. He is an active member of the American Osteopathic Association and American College of Osteopathic Emergency Physicians.

Kristen Rizzo, M.D.

Kristen Rizzo
Dr. Rizzo received her Medical Degree from Drexel University, College of Medicine in Philadelphia. She completed her residency at Einstein Medical Center in Philadelphia. She has been working in Emergency Medicine since July 2015 and comes to Hunterdon Medical Center from Lourdes Medical Center of Burlington County. Dr. Rizzo has authored and been published in numerous medical journals.

Anna Lim-Kates, MD

Anna Lim-Kates, MD

Nimish Mehta, M.D.

Nimish Mehta, M.D.Dr. Mehta received his medical degree through the combined BS/MD seven-year program at Stevens Institute of Technology in conjunction with UMDNJ-New Jersey Medical School. After his residency in 2002, Dr. Mehta began working for the Pegasus Emergency Group which works with Hunterdon Medical Center.

Edward Spector, M.D.

Edward Spector, M.D.Dr. Spector completed his residency in Emergency Medicine at the Medical College of Pennsylvania. He joined the Pegasus Group in 1998. Dr. Spector has been the President of Pegasus Emergency Group, PA and has been Chairman of Emergency Medicine at Hunterdon Medical Center since 2004.

Young Yoon, M.D.

Young Yoon, M.D.Dr. Yoon graduated from a seven year BS/MD program based in City College of New York. He went on to receive his medical degree from SUNY- Stony Brook School of Medicine. Dr. Yoon has been with Pegasus Emergency Group since 2005.

Robert Chang, MD

Robert Chang, MDDr. Chang received his Medical Degree from SUNY Stony Brook School of Medicine in Stony Brook, NY in 1994. He completed his residency at Bellevue Hospital NYU School of Medicine in 1998. Dr. Chang has previously worked at JFK Medical Center Emergency Department and Atlantic Urgent Care. Dr. Chang is Board Certified in Emergency Medicine and is a member of the American College of Emergency Physicians.

Joni Jefferson, DO

Joni Jefferson, DODr. Jefferson received her Doctor of Osteopathic Medicine degree from Philadelphia College of Osteopathic Medicine. She completed her osteopathic internship at St. Luke’s Hospital in Allentown in 2009 and completed her Family Medicine Residency at Hunterdon Medical Center in 2012. Dr. Jefferson is Board Certified in Family Medicine and she is a member of the American Academy of Family Practice and American Osteopathic Association.

Dwight Lee, MD

Dwight Lee, MDDr. Lee received his Ph.D. from UMDNJ Graduate School of Biomedical Sciences and his Medical Degree from UMDNJ – Rutgers Medical School. He completed his residency at UMDNJ- University Hospital in Newark. Dr. Lee has worked over 25 as an emergency medicine physician in hospitals throughout New Jersey. Trained and board certified in Internal medicine since 1989, he has an in-depth and advanced clinical experience in all aspects of emergency medicine.

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