Dr. John Allendorf

About Dr. John D. Allendorf

Dr. John Allendorf is a board-certified surgeon who specializes in surgical oncology. He has experience treating peritoneal mesothelioma and other cancers of the abdomen and is currently accepting patients in the greater New York area.

With more than 20 years in practice, Dr. Allendorf has extensive experience treating complex abdominal cancers. He specializes in procedures like cytoreductive surgery with HIPEC, which combines surgery with heated chemotherapy to target cancer in the abdomen.

Dr. Allendorf takes the time to understand each patient’s needs and goals and works with patients and their families to find the treatment approach that’s right for them.

“Above all, I want my patients to feel heard, informed, and supported. My approach to care begins with listening carefully, understanding each patient’s goals and concerns, and helping them navigate treatment with confidence.”
– Dr. John D. Allendorf, mesothelioma specialist

Mesothelioma Hope can help families connect with experienced mesothelioma specialists like Dr. Allendorf near them. Use our Free Doctor Match to get started.

What Health Conditions Does Dr. John D. Allendorf Treat?

Dr. Allendorf treats peritoneal mesothelioma and many other cancers affecting the abdomen and digestive system.

His primary areas of care include:

• Peritoneal mesothelioma
• Adrenal gland issues
• Appendix tumors
• Bile duct cancer
• Gallbladder cancer
• Liver cancer
• Neuroendocrine tumors
• Ovarian cancer
• Pancreatic cancer
• Peritoneal surface malignancies
• Stomach cancer

Dr. Allendorf works closely with other mesothelioma specialists to ensure each of his patients gets the care and support they need. This may include consulting with medical oncologists, gastroenterologists, radiation specialists, nutritionists, and oncology nurses as needed.

Dr. John D. Allendorf’s Mesothelioma Treatment Approach

As a surgical oncologist, Dr. Allendorf focuses on surgical procedures that remove as much cancer as possible while supporting long-term treatment goals.

When developing a treatment plan, he considers factors like:

• The extent of disease within the abdomen
• The patient’s health at the start of treatment
• Whether surgery is an appropriate option
• Eligibility for clinical trials

The most commonly recommended plan for early-stage peritoneal mesothelioma is cytoreduction with HIPEC. Through this option, Dr. Allendorf combines abdominal surgery to remove tumors with heated chemotherapy that destroys microscopic cancer cells.

Dr. Allendorf may also use other surgical techniques depending on a patient’s unique situation, such as the Whipple procedure for patients with pancreatic cancer.

“Whenever appropriate, I use minimally invasive and robotic techniques to support recovery while maintaining a high standard of surgical precision and safety.”
– Dr. John Allendorf, mesothelioma specialist

Dr. John Allendorf’s Medical Background

Dr. John Allendorf has built his career around treating complex abdominal cancers and advancing surgical oncology.

After graduating from medical school at Columbia University Vagelos College of Physicians and Surgeons, he completed a five-year surgical residency at New York-Presbyterian Hospital in 2002. He was also trained in liver transplantation surgery at New York-Presbyterian.

Today, he serves as Chair of the Department of Surgery and Professor of Surgery at NYU Grossman Long Island School of Medicine. In addition to caring for patients, he helps lead multidisciplinary cancer programs and trains future surgeons.

Dr. Allendorf’s Work Experience

Dr. Allendorf has experience with complex abdominal surgery, including cytoreduction with HIPEC, and has completed fellowship training in liver transplantation.

His experience includes:

• Chair, Department of Surgery, NYU Grossman Long Island School of Medicine
• Doctor of Medicine from Columbia University Vagelos College of Physicians and Surgeons
• Fellowship in Liver Transplant Surgery at New York-Presbyterian Hospital
• Professor of Surgery, NYU Grossman Long Island School of Medicine
• Residency in Surgery at New York-Presbyterian Hospital
• Surgical oncologist at NYU Langone Health

His experience with advanced abdominal surgery, HIPEC, and minimally invasive techniques allows him to provide specialized care for patients with peritoneal mesothelioma.

Highlights of Dr. John Allendorf’s Medical Career

Dr. Allendorf specializes in abdominal surgery and treats patients with peritoneal mesothelioma. He’s also a Fellow of the American College of Surgeons (FACS).

His work has included mesothelioma research at the Columbia University Mesothelioma Center. There, he worked with Dr. John Chabot to study surgical techniques and treatment options for patients.

Dr. Allendorf now chairs the Department of Surgery at NYU Grossman Long Island School of Medicine. His role combines patient care, training future surgeons, and leading multidisciplinary cancer programs.

Dr. Allendorf’s Awards and Accolades

Dr. Allendorf has been recognized for his expertise in surgical oncology, leadership, and medical education.

His career highlights include:

• Castle Connolly Top Doctors status (2014-present)
• New York Magazine Top Doctors listing (2017-2025)
• New York Metro Top Doctors listing
• Newsday Top Long Island Doctors listing (2015-2025)
• Patients’ Top Choice, U.S. News & World Report

Dr. Allendorf has also consistently received 5-star ratings from dozens of former patients.

Dr. John Allendorf’s Work in Cancer Treatment & Clinical Trials

Dr. Allendorf studies ways to improve surgery and treatment for people with peritoneal mesothelioma and other abdominal cancers.

His research interests include:

• Imaging tests to detect peritoneal mesothelioma
• Methods for delivering chemotherapy into the abdomen
• Minimally invasive and robotic surgery
• Results of surgery to remove abdominal tumors
• Ways surgery may affect tumor growth

Use our Free Doctor Match to connect with Dr. Allendorf or another specialist to explore treatments and clinical trials.

Dr. John Allendorf’s Research & Published Works

Dr. Allendorf has authored and contributed to research involving peritoneal mesothelioma, intraperitoneal chemotherapy, and other advances in abdominal cancer treatment.

Publications he’s featured in include:

• Neoadjuvant Therapy-Induced Remodeling in Pancreatic Ductal Adenocarcinoma: Multimodal Spatial Analysis and Prognosis. Published in Cancer Science, April 2026.
• Can Virtual Noncontrast Computed Tomography Improve the Diagnostic Uncertainty of Adrenal Incidentalomas? Published in Surgery, March 2026.
• Language-Based Exclusion Associations With Racial and Ethnic Disparities in Thyroid Cancer Clinical Trials. Published in Surgery, January 2025.
• Quantitative X-Ray Computed Tomography Peritoneography in Malignant Peritoneal Mesothelioma Patients Receiving Intraperitoneal Chemotherapy. Published in Annals of Surgical Oncology, December 2013.

His experience with complex abdominal cancers, combined with his commitment to research, is helping to potentially improve patient outcomes.

Get Connected With Dr. John D. Allendorf for Mesothelioma Care

Dr. John Allendorf is recognized for his expertise in treating peritoneal mesothelioma and other complex abdominal cancers. Additionally, patients consistently praise him for clearly and thoroughly reviewing treatment plans.

“I work to provide care that is thoughtful, individualized, and grounded in clear communication.”
– Dr. John Allendorf, mesothelioma specialist

If you or someone you love has been diagnosed with peritoneal mesothelioma, we’re here to help.

Call (866) 608-8933 or use our Free Doctor Match to connect with Dr. John Allendorf or another experienced mesothelioma specialist and learn more about your treatment options.