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Mariam Maniya, MD, is a board-certified internist at Maniya Health, located in Hamilton, New Jersey. Dr. Maniya has been practicing primary care for over 30 years and considers it an honor to care for individuals living in and around Mercer County. She gets to know you and your loved ones, and that's one of the many reasons that her patients love her. 

Dr. Maniya has led Maniya Health since 2000. She has extensive experience treating an array of chronic diseases, like diabetes, high blood pressure, and gastrointestinal disorders. Dr. Maniya also offers acute care and a range of preventive care services to keep you and your family healthy. 

To learn more about the services offered by Dr. Maniya and the Maniya Health team, call the office or book online today. 

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Dr. Nicholas Rossos, MD is an Internal Medicine & Primary Care Physician who has been practicing in Bordentown, NJ for 44 years and transitioned his practice to Maniya Health on July 1, 2024.

Dr. Rossos earned his Medical Degree from Far Eastern University in 1976 and completed his residency training in Internal Medicine from St. Michael's Medical Center in Newark, NJ in 1980. He then entered private practice in Bordentown, NJ where he served his local community. Dr. Rossos has devoted his entire career compassionately caring for his patients, and his selfless dedication to his patients is inspiring.

As of July 1, 2024 Dr. Rossos retired from active clinical practice and transitioned his patients to Maniya Health. If you are a former patient of Dr. Rossos, please call Maniya Health at (609) 581-9100 to coordinate an appointment and to assist in your ongoing care needs.

Marc Seelagy, MD is a Board-Certified Pulmonologist & Sleep Medicine Physician at Maniya Health located in Hamilton, New Jersey. He graduated from the University of Chicago, Pritzker School of Medicine, completed residency at the University of Colorado followed by fellowship at Johns Hopkins in Pulmonary, Critical Care, and Sleep Disorders Medicine.

Dr. Seelagy has decades of experience in both outpatient and inpatient medicine, and has taught medical residents and cared for critically ill patients as the Medical Director of the Intensive Care Unit at St. Francis Medical Center. He is also on staff at Capital Health, RWJ Hamilton & Penn Medicine Princeton Hospital.

In his spare time, Dr. Seelagy enjoys spending time with his family and scuba diving.

Please note that Maniya Health Medical Group does not employ or in any way supervise Dr. Marc Seelagy. He is employed by Virtua Medical Group, which subleases space from Maniya Health Medical Group. Patients should contact Virtua Medical Group's offices directly for all questions concerning their Pulmonology & Sleep Medicine treatment.

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A graduate of Stanford University, he earned his Bachelor's degree in Human Biology, laying a solid foundation for his medical career. His academic pursuits continued at Northwestern University Feinberg School of Medicine, where he earned his medical degree. At Northwestern, Dr. McKenzie's commitment to academic and clinical excellence was recognized through his induction into the prestigious Alpha Omega Alpha Honor Medical Society, an honor that recognizes academic achievements and dedication to the medical profession.

Following medical school, Dr. McKenzie pursued his dermatology residency at New York University. There, he honed his clinical and procedural skills under the mentorship of leading experts in the field. Demonstrating leadership and clinical acumen, he served as Chief Resident in his final year.

Dr. McKenzie is a well-published author, with several publications in reputable dermatology journals, which he has presented at national and international meetings. His research and clinical interests span a broad spectrum, including topics such as eczema, acne, hair loss, and health disparities. His work aims to advance the understanding and treatment of skin conditions and improve patient outcomes.

Beyond his clinical and research contributions, Dr. McKenzie is known for his compassionate patient care and his ability to combine scientific rigor with a personalized approach to treatment. He is an active member of the American Academy of Dermatology and is deeply committed to medical education and the training of future dermatologists.

Anastasios Manessis, MD, FACE, ECNU, ABOM, is a double-board certified physician at  Endocrine Associates of West Village PC in Murray Hill, Manhattan, and Long Island City, New York, specializing in endocrinology, diabetes, and metabolism and obesity medicine. Dr. Manessis has an endocrine certification in neck ultrasounds and has extensive experience in diagnosing, treating, and managing endocrine disorders, including diabetes, thyroid disorders, hormonal dysfunction, and obesity.  

Dr. Manessis pursued his undergraduate education at Manhattan College, graduating magna cum laude with distinction in biochemistry. He earned his medical degree from the State University of New York at Buffalo. Dr. Manessis completed a combined residency in internal medicine and pediatrics at New York Medical College at Saint Vincent’s Hospital in New York. Following a year as chief medical resident, he completed a two-year clinical fellowship in endocrinology, diabetes, and metabolism, where his research interest, among others, involved the use of insulin pumps in patients with Type II diabetes. 

In addition to his clinical practice, Dr. Manessis was a faculty member in the Department of Medicine at New York Medical College from 2008-2010. He then joined the faculty of New York University in 2011. He has been involved in many clinical research projects, including long-term studies to evaluate the efficacy and safety of GLP-I agonists and weight loss agents. Dr. Manessis’ primary clinical interest includes the treatment of diabetic patients with insulin pumps and how it has benefited the well-being of patients long-term.

Emmanuel Valery, MD, is a board-certified internist at LaSante Health Center in the Prospect Lefferts Gardens area of Brooklyn. Dr. Valery diagnoses and treats chronic illnesses, offers preventative and primary care, and provides excellent treatments for patients in New York City with cardiovascular, digestive, respiratory, circulatory or other chronic health issues.

Dr. Valery was born in Port-au-Prince, Haiti, and has been in the medical field for over three decades. He immigrated to New York, where he received his Bachelor of Science from Long Island University in New York City. Dr. Valery then completed his Doctor of Medicine at The Universidad del Noreste (UNE) School of Medicine in Tampico, Mexico. He went on to finish his residency in internal medicine at Kings County Hospital and completed the prestigious Fifth Pathway program for the Albert Einstein College of Medicine, both in New York City. 

Serving the community for years, Dr. Valery was the medical director at NewYork-Presbyterian Brooklyn Methodist Hospital, the CEO of Bedford Medical Group, and practiced at SUNY Downstate Medical Center, Kings County Hospital and the Bronx Lebanon Special Care Center, all in New York City.

Dr. Valery leads several community service and outreach initiatives and is a member of the NOAH NY, a not-for-profit organization that helps provide free health care to residents of Haiti. He has received numerous awards for his efforts.

As an immigrant and multilingual in English, Haitian Creole, French, and Spanish, Dr. Valery is passionate about serving diverse patients at LaSante Health Center. He brings years of medical knowledge to provide quality internal medicine care.

Dr. Valery is a member of the American Medical Association, Asclepius Medical Society, and certified by The American Board of Internal Medicine.

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Dexter McKenzie, MD, is an experienced internist and pediatrician serving patients of all ages at LaSante Health Center in the Prospect Lefferts Gardens area of Brooklyn. Dr. McKenzie has served the central Brooklyn community for over 30 years as a registered pharmacist and physician and treats a wide range of medical conditions for adults and children in New York City. 

After immigrating to Brooklyn from the Caribbean, Dr. McKenzie attended the public schools in the area, then received his Bachelor of Science in pharmaceutical and health sciences from Arnold and Marie Schwartz College of Pharmacy & Health Sciences at Long Island University in New York City. He completed his Doctor of Medicine at Meharry Medical College in Nashville, Tennessee, and was honored with a residency and internship in internal medicine and pediatrics from Kings County Hospital in New York City. 

Dr. McKenzie is proud to serve a diverse range of patients at LaSante Health Center and advocates as a health educator, mentor to youth, and for the medical care of single mothers and senior citizens. He is passionate about supporting the local arts and small businesses. His involvement in the community has garnered him several awards and recognition. 

Dr. McKenzie is president of the Provident Clinical Society of Brooklyn, and a member of the National Medical Association, Medical Society of the State of New York, New York Empire State Medical Association, and The Medical Society of the County of Kings.

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Education and training

• State University of New York, Downstate Medical Center, Master's in Family Nursing

Languages spoken

• English
• Spanish
• Hebrew