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Dr. Sheila Serin joins The Hirsh Center in September 2026 after completing her rheumatology fellowship at the Ochsner Clinic Foundation in New Orleans, where she served as chief fellow.

Patients with rheumatic and musculoskeletal conditions need more than a diagnosis. They need a physician who listens, explains clearly and helps them understand the path forward. Dr. Serin brings that approach to adults with autoimmune, inflammatory and connective tissue diseases.

Her patients can expect thoughtful, evidence-based care and a physician who takes their concerns seriously. Whether a patient is managing joint pain, inflammation or a complex autoimmune condition, Dr. Serin works to identify the cause, explain the options and build a treatment plan that fits the patient’s needs.

With special interest in autoimmune, inflammatory and connective tissue diseases, Dr. Serin helps patients navigate conditions such as rheumatoid arthritis, psoriatic arthritis, lupus, scleroderma, vasculitis, myositis, gout and osteoporosis. Her role as chief fellow sharpened her clinical judgment, strengthened her commitment to education and reflected the leadership patients can trust at The Hirsh Center.

A South Florida native, Dr. Serin is excited to return home and care for patients in the community where her interest in medicine first took shape. She earned her Bachelor of Science degree in neuroscience and behavior from Florida Atlantic University, graduating magna cum laude. During medical school, she received the Community Outreach Award for her dedication to service, advocacy and health education.

Outside of medicine, Dr. Serin enjoys traveling with her husband, staying active and making the most of life back home in South Florida. She looks forward to building meaningful, long-term relationships with patients and families at The Hirsh Center

Andres Ruiz, MD, FACC, is a top-ranked, board-certified cardiologist providing state-of-the-art care at South Palm Cardiovascular Associates. He serves patients in Delray Beach, Florida, offering each patient individualized care and attention customized for their specific medical needs and lifestyles. 

As a fellow of the American College of Cardiology, Dr. Ruiz has extensive experience in the diagnosis and management of heart diseases and related conditions, including heart attack, atrial fibrillation, heart failure, heart murmur, high blood pressure, high cholesterol, and pulmonary hypertension. He uses stress testing, echocardiography, angiography, and other advanced techniques to assess patients and manage their care. 

In addition to treating patients with existing diseases, Dr. Ruiz is also skilled in helping patients prevent cardiovascular disease through patient education and interventional approaches aimed at reducing the risks of disease.

Dr. Ruiz completed his medical degree at the Health and Science Institute (CES) in Medellin, Colombia, followed by a residency in internal medicine and a fellowship in cardiovascular disease at the Medical College of Georgia. He then completed another residency in interventional cardiovascular disease at Loyola University. In addition, he has been the recipient of several medical awards and has been widely published in peer-reviewed medical journals.

Dr. Ruiz enjoys the opportunity to care for new patients and looks forward to meeting them.

Charles Harring III, MD, FACC, is a board certified cardiologist at South Palm Cardiovascular Associates in Delray Beach, Florida. He is a fellow of the American College of Cardiology. 

Dr. Harring graduated from Florida State University, majoring in biological sciences, and earned his medical degree from the University of Florida College of Medicine. He completed his residency at Carolinas Medical Center in Charlotte, North Carolina, followed by a cardiology fellowship at the University of South Florida. Dr. Harring’s training included proficiency in general cardiology, echocardiography, nuclear cardiology, and cardiac catheterization, with subspecialization in pacemaker and implantable defibrillator placement.

Upon completing his fellowship, Dr. Harring started working in private practice with Mid Carolina Cardiology in Charlotte, North Carolina. While working for one of the largest cardiology groups in the country, he maintained an invasive practice, performing all modalities of cardiovascular care. While Dr. Harring continued to battle all aspects of cardiovascular disease, he became attentive to catching diseases before events happened. It was at this time he was first exposed to the developing practice of preventive cardiology.

Dr. Harring joined the team at South Palm Cardiovascular Associates for social reasons, and his focus changed from a more non-invasive practice to prevention. As a clinical cardiologist, including echo and nuclear cardiology, he has developed extensive growth and training in the science of advanced lipidology. His memberships in the National Lipid Association and American Society of Preventative Cardiologists have continued to form a backbone for his continued education.

His future direction and desires include developing an integrative cardiology practice, incorporating not only traditional allopathic teachings but also blending functional and holistic approaches.

Michael Metzger, MD, FACC, is a fellowship-trained interventional cardiologist, with special expertise and training in vascular medicine and endovascular procedures. At South Palm Cardiovascular Associates in Delray Beach, Florida, he has extensive experience detecting and diagnosing the full range of cardiovascular disorders, and provides effective, individualized treatment to his patients.

Dr. Metzger earned his medical degree at the Sackler School of Medicine at Tel Aviv University in Israel. He then completed his internal medicine residency at Thomas Jefferson University Hospital in Philadelphia, Pennsylvania, before completing a cardiology fellowship at the University of Pittsburgh Medical Center. Afterward, he finished an interventional cardiology fellowship at Lankenau Medical Center in Wynnewood, Pennsylvania. He is board-certified in interventional cardiology, cardiovascular diseases, and internal medicine.

His specialties include the detection and treatment of peripheral arterial disease, as well as diagnosing and treating venous insufficiency. Dr. Metzger is an expert in transradial cardiac catheterization and serves on panels for the “Cardiac Alert” service, which provides prompt interventional services for patients entering the emergency room with heart attacks.

Gustavo Cardenas, MD, FACC, is a highly trained and experienced interventional cardiologist and vascular medicine specialist at South Palm Cardiovascular Associates. At the practice in Delray Beach, Florida, he provides direct patient care and consultative services. 

He is dedicated to the prevention, evaluation, and management of cardiac and vascular problems non-invasively and invasively. Dr. Cardenas takes pride in taking the time to listen to his patients, examining them, and establishing personalized care strategies for all of their cardiac and vascular problems.

Dr. Cardenas’ clinical interests include the prevention and management of hypertension, as well as the interpretation of cardiac and vascular tests. He is certified as a hypertension specialist by the American Society of Hypertension and is a registered physician in vascular interpretation. He is also a fellowship-trained vascular and endovascular specialist, treating all types of vascular diseases.

His invasive cardiology interests include minimally-invasive interventional procedures to restore blood flow to blocked coronary and peripheral arteries, treatment of aneurysms, and management of complex cases using advanced technologies. Dr. Cardenas has developed special and unique expertise in the treatment of structural heart diseases, including valvular diseases and procedures to prevent stroke and treat congenital abnormalities.

When clinically indicated, Dr. Cardenas performs coronary procedures through radial access (transradial), an approach that leads to better procedural outcomes and improved patient comfort. He also performs outpatient endovenous ablation for the treatment of varicose veins.

Frederick Tackey, MD, is a pulmonary and sleep medicine physician with over 25 years of experience providing compassionate, patient-centered care. At the Pulmonology & Sleep Center in Boynton Beach and Delray Beach, Florida, Dr. Tackey offers his patients a wide range of cutting-edge treatments for a number of different lung condition and lung treatments.

After receiving his Doctor of Medicine from the University of Ghana School of Medicine in Accra, Ghana, Dr. Tackey went on to complete his residency in internal medicine at the Johns Hopkins affiliated Good Samaritan Hospital in Baltimore, Maryland. Dr. Tackey continued his postgraduate training with a fellowship in pulmonary and critical care at the University of Miami Jackson Memorial Medical Center in Florida. Prior to his work at the Pulmonology & Sleep Center, Dr. Tackey provided critical care to patients at JFK Medical Center in Atlantis, Florida. He continues to partner with Bethesda Memorial Hospital in Boynton Beach, Florida and Delray Medical Center in Delray, Florida. 

Dr. Tackey provides safe and effective care for a number of pulmonary conditions and sleep disorders. He uses pulmonary function tests, bronchoscopies, and a number of other in-office diagnostics to develop personalized treatment plans. Dr. Tackey has extensive experience using the latest technologies to achieve the best outcomes for each of his patients.

Gershwin Blyden, MD, PhD, FCP, FACP, is a board-certified hematologist-oncologist and medical director of The Foundation for Sickle Cell Disease Research, with locations in Homestead, Orlando, Lakeland, Jacksonville, Belle Glade, Tallahassee, and Hollywood, Florida. With more than 40 years of diverse experience, Dr. Blyden is an esteemed physician in his field.

After receiving his bachelor’s degree in plant science from the Tuskegee Institute (now Tuskegee University) in Tuskegee, Alabama, in 1967, Dr. Blyden earned a PhD in pharmacology from prestigious Yale University in New Haven, Connecticut, in 1976. Just three years later, he also earned his medical doctorate cum laude from Yale University.

In 1985, Dr. Blyden completed an internal medicine internship at Massachusetts General Hospital in Boston, Massachusetts. That same year, he also finished his hematology/oncology and clinical pharmacology fellowship at Tufts Medical Center in Boston, Massachusetts. 

After graduating and completing his training, Dr. Blyden worked as an adjunct professor for the Barry University School of Podiatric Medicine in Miami Shores, Florida, an associate clinical professor of hematology and oncology at the University of Miami School of Medicine in Miami, Florida, and as an associate professor of clinical pharmacy and director of the Clinical Pharmacology Research Unit at Florida A&M University’s Miami location.

Today, Dr. Blyden is a leader in the field of sickle cell treatment, case management, and research. He provides comprehensive care for chronic diseases, with a special emphasis on sickle cell anemia. 

Dr. Blyden offers a variety of infusion services, school individualized education program (IEP) support, transcranial Doppler ultrasounds, and more.

About Us

The Foundation for Sickle Cell Disease Research (FSCDR) is a renowned organization solely focused on medical care and clinical research opportunities for those living with Sickle Cell Disease. FSCDR has locations across the State of Florida. Its Flagship is in Hollywood, Florida.

As the only organization in the United States with standalone sickle cell Centers of Excellence, The Foundation for Sickle Cell Disease Research welcomes patients from all over the world. The team of physicians, specialists, care coordinators, case managers, and social work professionals combine to provide all-inclusive care for children and adults with sickle cell disease.

Their stated mission is to tirelessly research, inform, hear, respect, treat, and support all individuals with sickle cell disease, and to make the disease a livable, non-threatening condition. In addition, they do innovative diagnostic testing, such as transcranial Doppler ultrasounds, X-rays, and medical treatments, including infusion services.

The team at The Foundation for Sickle Cell Disease Research works with other medical and education professionals to ensure that their patients of all ages receive the care and support they need to thrive, ranging from vaccinations to medication management and social work services.

Along with school individualized educational plan (IEP) support, disability application assistance, and case management, they help patients work through the social determinants of health to ensure patients receive the proper support they need.

To schedule an appointment with The Foundation for Sickle Cell Disease Research, call or book online today.

Dr. Marie Amanze is a Hematologist/Oncologist serving FSCDR patients in the Jacksonville and Florida Panhandle regions. She specializes in the diagnosis, treatment, and long-term management of blood disorders, including sickle cell disease, and is dedicated to improving patient outcomes through comprehensive and compassionate care.