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Endocrinology Associates of Princeton

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Welcome to Advocare Endocrinology Associates of Princeton

Whether performing an ultrasound guided biopsy of a suspicious thyroid nodule or using the latest technology to obtain continuous blood sugar readings to optimize glycemic control, it is our responsibility to stay on top of the latest diagnostic and treatment modalities and we take this responsibility seriously. We are committed to providing evidence-based care to our patients; that is, we base our decision making on the most current medical literature. 


Unlike large, impersonal groups, we strive to be different. We take great pride in being available to our patients and colleagues in the community. We hope that every treatment plan is the product of collaboration between an informed patient and a knowledgeable physician. 


Finally, the work we do is only as good as the effort put forth by our patients; therefore, we insist that every patient is involved in and dedicated to their health.

Jason M Hollander MD, ECNU

Jason M Hollander MD, ECNU

Dr. Hollander was raised in Princeton, N.J. He attended Princeton Day School, followed by Princeton University. He graduated with honors from Princeton University in 1994. Dr. Hollander earned his M.D. from the University of Medicine and Dentistry of New Jersey. Once again he graduated with honors and was awarded membership to Alpha Omega Alpha (AOA), the highest honor bestowed on a graduating medical student. Dr. Hollander completed his internship and residency at the Mount Sinai Hospital in New York City. He served as chief resident from 2002-2003, and was recognized as an outstanding teacher in the medical community during that year. Subsequently, Dr. Hollander completed his fellowship in Endocrinology, Metabolism, and Bone Diseases at the Mount Sinai Hospital. His academic interests included bone metabolism in critical illness, thyroid autoimmunity, and nutrition support in the chronically critically ill.

Ansu V Joy MD, ECNU

Dr. Joy grew up in Long Island, New York. She received her undergraduate degree from Boston University in 2000. She spent the following two years in research at the Massachusetts Institute of Technology in Cambridge, MA. Dr. Joy earned her medical degree from Ross University, graduating with high honors. She completed her internship and residency in Internal Medicine at the University of Connecticut. During her residency she was awarded the Resident of the Year Ambulatory Care Award and a special Letter of Commendation from the program director. She remained at the University of Connecticut and completed a rigorous fellowship in Endocrinology, Metabolism, and Bone Disease.

Sefton C Vergano MD, ECNU

Dr. Sefton Vergano received his undergraduate degree in biology from the University of Pennsylvania in 1997. He subsequently joined the biochemistry department at New York University. His work there culminated in the publication of an innovative study in the Journal of Biological Chemistry. After two years in the lab, Dr. Vergano returned to Philadelphia to complete his medical degree. He attended the Temple University School of Medicine and earned his medical degree in 2004. Dr. Vergano completed his internship and residency at Thomas Jefferson University Hospital.

Daphne Dadzie MD

Dr. Dadzie earned her Bachelors of Science degree in biology from Rutgers University in 2002. As part of an early matriculation program, she began her medical training at UMDNJ – Robert Wood Johnson Medical School in her final year of college. Deeply concerned about the global diabetes epidemic, Dr. Dadzie decided to pursue a Masters Degree in Public Health which she earned in conjunction with her medical degree. She became the youngest member of the New Jersey Department of Health&rsqu...

Shirley Bembo MD, ECNU

Dr. Shirley Bembo received her Bachelor of Science degree in Chemistry at the University of the Philippines in 1993. She pursued her Medical Degree at the University of the East Medical Center in the Philippines where she graduated as the Class Valedictorian in 1997. She was voted as Most Outstanding Intern during her Post Graduate Internship in 1998. Dr. Bembo completed her Internal Medicine Residency at New York Medical College—Brooklyn and Queens Program in 2002. She completed her Fe...

Diane Fresca MD

Dr. Diane Fresca completed her undergraduate education at Franklin & Marshall College in Lancaster, Pennsylvania. She earned her Bachelor of Arts degree in biology and graduated with magna cum laude honors in 1997. While at F&M, Dr. Fresca also received both Phi Beta Kappa and Marshall Scholar honors. She returned to her home state of New Jersey to pursue her medical education at UMDNJ-Robert Wood Johnson Medical School and received her M.D. in 2001. Prior to graduation, Dr. Fresca was awarded membership to Alpha Omega Alpha (the highest honor bestowed upon a graduating medical student). Dr. Fresca remained at Robert Wood Johnson Medical School for her internal medicine residency and became board certified in internal medicine in 2004. She was subsequently selected as chief resident for the 2004-2005 academic year. During her chief year, Dr. Fresca organized and actively participated in the residency’s community service program. In recognition of her efforts, she was awarded the Internal Medicine Residency’s Humanism and Professionalism Award in 2005.

Tiffany Tsang MD

Dr. Tsang was born in Dallas, Texas but raised in Hong Kong. She returned to the United States and obtained her undergraduate degree in biology from the University of Michigan. After graduating, she spent two years in the Bronx, teaching science to high school students. She subsequently earned her medical degree from Texas Tech University. In medical school, she passionately served her community, volunteering at various health clinics and participating in medical mission trips. She completed her residency training at Eastern Virginia Medical School and became board certified in Internal Medicine in 2019. 

Sunny Patel MD

Dr. Sunny Patel was born and raised in New Jersey. He received his undergraduate degree in biology from New York University in 2014. He later earned his medical degree from Ross University School of Medicine in 2018, where he graduated with high honors. Dr. Patel went on to complete his internship and residency in Internal Medicine at Long Island Jewish Forest Hills Hospital in Queens, NY in 2021, where he earned the distinction of Outstanding Resident of the Year during his second year of training. He became board certified in Internal Medicine upon completion of his residency in 2021.

Ronak Patel MD

Dr. Patel graduated Summa Cum Laude from the University of Maryland College Park with high honors in Biology. During his undergraduate training, he performed research projects at the United States Food and Drug Administration (FDA) and at the University of Maryland.   He subsequently went to Washington DC to obtain his medical degree from George Washington University School of Medicine and Health Sciences. He graduated medical school with distinction.

Sherin E Mathews MD

Dr. Mathews earned her medical degree from MOSC Medical College, India in 2011, and completed her Internal Medicine residency at Mount Sinai Morningside-West in New York City. After completing her residency, Dr. Mathews worked as a primary care provider at Mount Sinai Doctors, New York. Due to her continued passion in understanding about hormonal disorders, she completed an Endocrinology fellowship from the University of Florida, Gainsville. Dr. Mathews has authored multiple research publications and is board certified by the American Board of Internal Medicine and Endocrinology, Diabetes and Metabolism.

Lianne Dehnam, APN

Meet Our Providers

Lianne Dehnam, APN
Jason M Hollander MD, ECNU

Jason M Hollander MD, ECNU

Dr. Hollander was raised in Princeton, N.J. He attended Princeton Day School, followed by Princeton University. He graduated with honors from Princeton University in 1994. Dr. Hollander earned his M.D. from the University of Medicine and Dentistry of New Jersey. Once again he graduated with honors and was awarded membership to Alpha Omega Alpha (AOA), the highest honor bestowed on a graduating medical student. Dr. Hollander completed his internship and residency at the Mount Sinai Hospital in New York City. He served as chief resident from 2002-2003, and was recognized as an outstanding teacher in the medical community during that year. Subsequently, Dr. Hollander completed his fellowship in Endocrinology, Metabolism, and Bone Diseases at the Mount Sinai Hospital. His academic interests included bone metabolism in critical illness, thyroid autoimmunity, and nutrition support in the chronically critically ill.

Ansu V Joy MD, ECNU

Dr. Joy grew up in Long Island, New York. She received her undergraduate degree from Boston University in 2000. She spent the following two years in research at the Massachusetts Institute of Technology in Cambridge, MA. Dr. Joy earned her medical degree from Ross University, graduating with high honors. She completed her internship and residency in Internal Medicine at the University of Connecticut. During her residency she was awarded the Resident of the Year Ambulatory Care Award and a special Letter of Commendation from the program director. She remained at the University of Connecticut and completed a rigorous fellowship in Endocrinology, Metabolism, and Bone Disease.

Sefton C Vergano MD, ECNU

Dr. Sefton Vergano received his undergraduate degree in biology from the University of Pennsylvania in 1997. He subsequently joined the biochemistry department at New York University. His work there culminated in the publication of an innovative study in the Journal of Biological Chemistry. After two years in the lab, Dr. Vergano returned to Philadelphia to complete his medical degree. He attended the Temple University School of Medicine and earned his medical degree in 2004. Dr. Vergano completed his internship and residency at Thomas Jefferson University Hospital.

Daphne Dadzie MD

Dr. Dadzie earned her Bachelors of Science degree in biology from Rutgers University in 2002. As part of an early matriculation program, she began her medical training at UMDNJ – Robert Wood Johnson Medical School in her final year of college. Deeply concerned about the global diabetes epidemic, Dr. Dadzie decided to pursue a Masters Degree in Public Health which she earned in conjunction with her medical degree. She became the youngest member of the New Jersey Department of Health&rsqu...

Shirley Bembo MD, ECNU

Dr. Shirley Bembo received her Bachelor of Science degree in Chemistry at the University of the Philippines in 1993. She pursued her Medical Degree at the University of the East Medical Center in the Philippines where she graduated as the Class Valedictorian in 1997. She was voted as Most Outstanding Intern during her Post Graduate Internship in 1998. Dr. Bembo completed her Internal Medicine Residency at New York Medical College—Brooklyn and Queens Program in 2002. She completed her Fe...

Diane Fresca MD

Dr. Diane Fresca completed her undergraduate education at Franklin & Marshall College in Lancaster, Pennsylvania. She earned her Bachelor of Arts degree in biology and graduated with magna cum laude honors in 1997. While at F&M, Dr. Fresca also received both Phi Beta Kappa and Marshall Scholar honors. She returned to her home state of New Jersey to pursue her medical education at UMDNJ-Robert Wood Johnson Medical School and received her M.D. in 2001. Prior to graduation, Dr. Fresca was awarded membership to Alpha Omega Alpha (the highest honor bestowed upon a graduating medical student). Dr. Fresca remained at Robert Wood Johnson Medical School for her internal medicine residency and became board certified in internal medicine in 2004. She was subsequently selected as chief resident for the 2004-2005 academic year. During her chief year, Dr. Fresca organized and actively participated in the residency’s community service program. In recognition of her efforts, she was awarded the Internal Medicine Residency’s Humanism and Professionalism Award in 2005.

Tiffany Tsang MD

Dr. Tsang was born in Dallas, Texas but raised in Hong Kong. She returned to the United States and obtained her undergraduate degree in biology from the University of Michigan. After graduating, she spent two years in the Bronx, teaching science to high school students. She subsequently earned her medical degree from Texas Tech University. In medical school, she passionately served her community, volunteering at various health clinics and participating in medical mission trips. She completed her residency training at Eastern Virginia Medical School and became board certified in Internal Medicine in 2019. 

Sunny Patel MD

Dr. Sunny Patel was born and raised in New Jersey. He received his undergraduate degree in biology from New York University in 2014. He later earned his medical degree from Ross University School of Medicine in 2018, where he graduated with high honors. Dr. Patel went on to complete his internship and residency in Internal Medicine at Long Island Jewish Forest Hills Hospital in Queens, NY in 2021, where he earned the distinction of Outstanding Resident of the Year during his second year of training. He became board certified in Internal Medicine upon completion of his residency in 2021.

Ronak Patel MD

Dr. Patel graduated Summa Cum Laude from the University of Maryland College Park with high honors in Biology. During his undergraduate training, he performed research projects at the United States Food and Drug Administration (FDA) and at the University of Maryland.   He subsequently went to Washington DC to obtain his medical degree from George Washington University School of Medicine and Health Sciences. He graduated medical school with distinction.

Sherin E Mathews MD

Dr. Mathews earned her medical degree from MOSC Medical College, India in 2011, and completed her Internal Medicine residency at Mount Sinai Morningside-West in New York City. After completing her residency, Dr. Mathews worked as a primary care provider at Mount Sinai Doctors, New York. Due to her continued passion in understanding about hormonal disorders, she completed an Endocrinology fellowship from the University of Florida, Gainsville. Dr. Mathews has authored multiple research publications and is board certified by the American Board of Internal Medicine and Endocrinology, Diabetes and Metabolism.

Lianne Dehnam, APN

Jason M Hollander MD, ECNU

Dr. Hollander was raised in Princeton, N.J. He attended Princeton Day School, followed by Princeton University. He graduated with honors from Princeton University in 1994. Dr. Hollander earned his M.D. from the University of Medicine and Dentistry of New Jersey. Once again he graduated with honors and was awarded membership to Alpha Omega Alpha (AOA), the highest honor bestowed on a graduating medical student. Dr. Hollander completed his internship and residency at the Mount Sinai Hospital in New York City. He served as chief resident from 2002-2003, and was recognized as an outstanding teacher in the medical community during that year. Subsequently, Dr. Hollander completed his fellowship in Endocrinology, Metabolism, and Bone Diseases at the Mount Sinai Hospital. His academic interests included bone metabolism in critical illness, thyroid autoimmunity, and nutrition support in the chronically critically ill.

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