Our Team

The Princeton Longevity Center Staff Brings The Highest Levels Of Expertise To Your Care

All our physicians are American-trained and board-certified.

The Princeton Longevity Center’s staff’s knowledge and experience are unmatched by any other preventive medicine center in the region.

Doctors

David A Fein, MD

MEDICAL DIRECTOR / CEO

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John Rumberger PhD, MD, FACC

Physician - Director of Cardiac Imaging

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Daniel Karlsberg, MD

ASSOCIATE MEDICAL DIRECTOR, NYC PHYSICIAN and Cardiologist

Dietitians

Alexa Essenfeld MS, RD

REGISTERED DIETITIAN- PRINCETON, NJ

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Stacey Milak, RDN

Registered Dietitian

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Elli Kmiec, MBA, RDN, CDN

NYC REGISTERED DIETITIAN

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Barbara Bacal, RDN

REGISTERED DIETITIAN - SHELTON, CT

Paige Heiden, MS, RDN

NYC REGISTERED DIETITIAN

Exercise Physiologists

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Dr. Harry Pino

Exercise Physiology Manager

Louis Degnan M.S, CPT, NSCA TSAC-F

EXERCISE PHYSIOLOGIST- PRINCETON, NJ

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Isabella Burns, EP-C, BS, ACSM

EXERCISE PHYSIOLOGIST - SHELTON, CT

CT Techs & Nurses

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Darlene Chuva, RT (R, CT)

Senior Ct Technologist

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Sharon Ammariti RN, BSN

Clinical Manager

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Nicole Grignoli RT (R, CT)

CT TECHNOLOGIST NYC

Clinical Staff

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Jose Borja, BS

Medical Technologist

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Victoria Wilcox, BS, RMA

Medical Assistant

Non-Clinical

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Doug Cerminaro, MPA

COO

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Jillian Rhodes

NJ Office Manager

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Milana Cantres

NYC OFFICE MANAGER

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Kristina DeGrandi

Office Manager CT

About David A Fein

Founder and Medical Director of the Princeton Longevity Center, Dr. David Fein has been a practicing physician with nearly 30 years of combined experience in Internal Medicine, Cardiovascular Diseases and Chronic Disease Prevention. He has traveled extensively to research the latest in medical advances, technology and wellness tools to incorporate into his nationally recognized preventive medicine center.

Dr. Fein is a Founding Member of the Society for Cardiovascular CT and remains one of the few Internists in the world that are Board Certified in Cardiac CT. He is an expert lecturer on topics such as Radiation Reduction Techniques and Coronary Artery Calcium Scoring in the clinical setting and has taught and certified hundreds of physicians to become proficient in the field of Cardiac CT.

He has also been invited nationally and internationally to speak at leading conferences on Preventive Medicine and lectures extensively on topics in preventive medicine, executive health, lifestyle management, and more. Additionally, Dr. Fein has been involved in developing health-related legislation in New Jersey.

A graduate of Franklin & Marshall College in Lancaster, PA, Dr. Fein received his medical degree from New York University School of Medicine and was elected to the Alpha Omega Alpha Medical Honor Society. Dr. Fein completed his residency training at Bellevue Hospital – New York University Medical Center and is Board Certified in Internal Medicine and Cardiac CT.

About Alexa Essenfeld

Alexa Essenfeld is a Registered Dietitian with years of experience educating and encouraging others about the importance of nutrition and wellness. Alexa graduated from Rutgers University with a degree in dietetics and then went on to pursue her masters and dietetic internship at the College of Saint Elizabeth.

Prior to coming to PLC, Alexa was the campus dietitian at a local university where she helped manage the dietary needs of those with food allergies. While at the university, Alexa also created unique vegan, gluten free and allergen free menus for the entire campus. Alexa also has experience counseling professional and Division 1 athletes on adopting sports performance diets. When working with clients, Alexa takes time to understand individual barriers and helps people discover how they can make improvements (big or small) to become the healthier person they aspire to be. Alexa has been affiliated with the Academy of Nutrition and Dietetics and the NJ Academy of Nutrition and Dietetics for over 8 years.

About Paige Heiden

Paige Heiden is our Registered Dietitian in New York City. She is a graduate of the University of Delaware with a Bachelor of Science in Nutrition and Dietetics. During her undergraduate career, Paige was a research assistant in several studies, investigating obesity in the pediatric population. Paige also earned her Master of Science in Clinical Nutrition from Rutgers University where she completed their Entry Level Master of Science in Clinical Nutrition (ELMSCN) program. Paige completed her dietetic supervised practice hours at several locations in New Jersey, including Cooperman Barnabas Medical Center, Kessler Rehabilitation and Rutgers Athletics.

Prior to joining PLC, Paige was an inpatient and outpatient Dietitian in Livingston, NJ. Paige covered all units of her inpatient facility including, but not limited to, pediatric and adult intensive care, transplant and burn units. Paige’s outpatient work took place at neurology, cardiology and weight management offices in Livingston and West Orange, NJ. Paige has also worked in the private practice space since 2021, with focuses on weight management and disordered eating. Paige loves helping her patients and clients learn the science behind nutrition, improve their relationships with food and reach their goals.

Through education and professional practice, Paige has gained experience in counseling patients across the lifespan with various chronic conditions including, but not limited to, cardiovascular disease, obesity, epilepsy and diabetes. Paige’s specific nutrition areas of interest include cardiovascular health and sustainable weight management through flexible dieting.

About Louis Degnan

Louis Degnan, M.S., is a National Strength & Conditioning Association Certified Personal Trainer and a National Strength & Conditioning Association Tactical Strength & Conditioning Facilitator

Prior to joining The Princeton Longevity Center, Louis was a Wellness Coordinator at a United Methodist Homes in his hometown of Wilkes-Barre, Pennsylvania. He also worked as a Personal Trainer, EKG/Telemetry Technician, and Physical Therapy Aide both during and upon completion of his graduate coursework.

Louis received his Bachelor’s from East Stroudsburg University and his Master’s Degree from Bloomsburg University, both in Exercise Science. With his education and experience, Louis’ career goal is to make himself and expert in preventive medicine throughout the lifespan. Louis has experience in working with adults of all ages and recreationally active populations in physical therapy clinics, hospitals, commercial gyms, and group settings.

In his spare time, Louis is a self-proclaimed “comic book nerd”. He attends various comic book conventions annually and passionately incorporates healthy lifestyle and fitness habits to look the super-hero part in costume.