* * * * INCLEMENT WEATHER ALERT * * *
Based on reported weather conditions as of Monday, January 26, 2026 12:30pm the Princeton Medical Group has the following updates:
Monday, January 26, 2026 – As previously reported, all 3 Office locations are CLOSED. Patients with office appointments have been contacted for rescheduling.
Tuesday, January 27, 2026 – All 3 Office locations will be OPEN and continue regularly scheduled office hours.
For procedures at other facilities, those respective facilities will make determinations and notifications as appropriate.
Please visit this website for further updates
We apologize for any inconvenience this has caused

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John Sierocki, MD, FACP
Oncology & Hematology

John Sierocki, M.D.

Dr. Sierocki treats patients at the following locations:
Tuesday: Suite 101Monday, Wednesday, Thursday: 2nd Floor

To schedule an appointment, call 609.924.9300

  • Bio
  • Education
  • Areas of Focus
  • Did You Know?

Bio

John Sierocki, M.D., is board certified in Internal Medicine and Medical Oncology. He joined Princeton Medical Group in 1978 and is a senior attending physician at Penn Medicine Princeton Medical Center.

Education

College

Kings College

Medical School

Hahnemann Medical College

Residency

Completed residency at Hahnemann Medical College Hospital; completed medical oncology fellowship at Memorial Sloan Kettering Cancer Center

Areas of Focus

Solid Tumor Oncology, Lymphoma, Myeloma, Anemia

Did You Know?

Dr. Sierocki has considered himself a holistic physician with a multidisciplinary approach to patient care before it was in vogue to espouse such an attitude. Dr. Sierocki also loves to drive old cars!

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