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Dr. Ijaz Ahmad, M.D., F.A.C.C., is an experienced cardiologist, skilled in the diagnosis and treatment of an array of heart-related diseases and conditions in patients from Park Slope and throughout Brooklyn, NY. At Park Slope Cardiac and Diagnostic, Dr. Ahmad offers patient-centered care for issues like congestive heart failure (CHF), coronary artery disease (CAD), peripheral vascular disease (PVD and PAD) and chest pain. With advanced training in cardiac diagnostic imaging, Dr. Ahmad is skilled in performing echocardiograms, nuclear stress testing and ultrasounds, as well as cardiac catheterization and other minimally-invasive procedures.

A fellow of the American College of Cardiology (F.A.C.C.), Dr. Ahmad specializes in non-invasive and minimally-invasive cardiology to help patients get the care they need while avoiding surgery whenever possible. He and his team at Park Slope Cardiac and Diagnostic are committed to providing the highest quality care throughout every phase of treatment. Patients receive compassionate, customized care focused on their needs and based on in-depth evaluations using state-of-the-art testing and diagnostic techniques and technology for long-term health and wellness. With an emphasis on prevention and education, Dr. Ahmad helps patients understand their medical issues and risks, providing them with the education they need to enjoy better health and a better quality of life.

Dr. Ahmad completed his medical degree at Allama Iqbal Medical College, followed by a residency and internship at Interfaith Medical Center and a fellowship in cardiovascular diseases at New York Methodist Hospital. Widely published in top medical journals, including the International Journal of Cardiovascular Diseases and the Journal of Nuclear Cardiology, Dr. Ahmad was awarded the New York’s Top Doctors Award in 2016. Certified in nuclear cardiology by the American Society of Nuclear Cardiology (ASNC) and echocardiography by the National Board of Echocardiography (NBE), Dr. Ahmad maintains active memberships in several professional societies, including the American College of Cardiology, the American Society of Echocardiography, the American Society of Nuclear Cardiology and the American College of Physicians.

Park Slope Cardiac and Diagnostic welcomes new patients and accepts most major insurance plans. Dr. Ahmad speaks both English and Hindi.

Dr. Henry Siu earned his Medical Degree from the Sophie Davis School of Biomedical Education/SUNY Downstate Medical Center. He completed his post-graduated training in Internal Medicine at Yale New Haven Hospital, and Cardiology/Interventional Cardiology Fellowship at Thomas Jefferson University Hospital in Philadelphia. 

Dr. Siu has expertise in general cardiology, multi-modality cardiac imaging, and vascular imaging. As an interventional cardiologist, Dr. Siu is highly skilled in cardiac catheterizations and peripheral vascular interventions, and management of complex coronary/valvular heart disease. He has proven experience in private practice and in the academic setting, with focus on providing the highest quality care and most up-to-date diagnostic and treatment strategies. In his free time, Dr. Siu enjoys exercising and playing the piano. Dr. Siu speaks Cantonese, Mandarin, and English.

Tak Kwan, MD, FAHA, FACC, FACP, FSCAI, is a board-certified and internationally renowned cardiologist at Chinatown Cardiology, PC, in the Chinatown and Upper West Side areas of New York City, Brooklyn and Flushing, New York. Chief of Cardiology, Lenox Hill Greenwich Village, Northwell Health, Director, Asian Practice Initiatives at Lenox Hill Hospital, Clinical Professor of Medicine/Cardiology, Zucker School of Medicine at Hofstra/Northwell, and President, Chinatown Cardiology, P.C. Dr. Kwan earned his medical degree and completed his residency at the State University of New York Downstate Medical Center. For the past 20 years, Dr. Kwan has been an active member within the Chinese community. He served as the president of the Chinese-American Medical Society. He then went on to establish Chinatown Cardiology in order to assist those in the neighborhood. Due to his generous donations and charitable services for the community, Dr. Kwan was awarded the Ellis Island Medal of Honor in 2010.

Dr. Kwan is now the interventional cardiology director at Mount Sinai West, the catheterization laboratory co-director at Mount Sinai Beth Israel, and the affiliate medical director of international services at Mount Sinai Health. He is affiliated with Mount Sinai Beth Israel, serving as a professor at the Icahn School of Medicine, the executive director of Asian services, and the site program director of interventional cardiology. Besides being directly involved in patient care, Dr. Kwan is also an active participant in clinical research.

Dr. Kwan is recognized internationally as an expert in general and interventional cardiology. Not only is he incredibly skilled, but he is also a pioneer in transradial cardiac catheterization, complex percutaneous coronary intervention, structural heart intervention, and transpedal lower extremity peripheral catheterization. Dr. Kwan is committed to providing only the best treatment available to his patients. Whether the patient is seeking treatment for routine heart disorders or is suffering from more complex symptoms, Dr. Kwan has the experience and skills necessary to ensure that the proper care and attention are provided to every patient at Chinatown Cardiology.

For a highly skilled and knowledgeable cardiologist, make an appointment with Dr. Kwan either online or by phone today.

Dr. Jacqueline Chan received her Medical Degree from New York Medical College.   She completed her Internal Medicine residency in addition to a chief resident year at the former St. Vincent’s Catholic Medical Center.   Dr. Chan began her Cardiovascular Disease fellowship at St.   Vincent’s Catholic Medical Center and transitioned to New York Methodist Hospital to complete her clinical training.   She is proficient in exercise treadmill stress test, echocardiography, nuclear myocardial perfusion scan, and peripheral vascular duplex.   Dr. Chan completed training as a vein specialist and performs radiofrequency venous ablation in our ambulatory procedure lab.  Currently, she is the Medical Director of Echocardiography and Vascular Imaging for our accredited ICAEL and ACR facility.  Dr. Chan is multi-board certified in Internal Medicine, Echocardiography, Nuclear Cardiology, and Cardiovascular Diseases.

Jennifer Chen, MD, FACC, is a board-certified cardiologist specializing in internal medicine, echocardiography, nuclear cardiology, and cardiovascular diseases at Chinatown Cardiology, PC, in the Chinatown section of New York City and Brooklyn and Flushing, New York. Dr. Chen earned her undergraduate degree at the University of California, Berkeley. She then went on to complete her medical training at Albert Einstein College of Medicine in The Bronx, New York. She performed her residency at Mount Sinai Beth Israel and her fellowship at Lenox Hill Hospital. 

Dr. Chen only employs the latest technology to provide accurate diagnoses and up-to-date treatments. She utilizes cutting-edge imaging techniques to detect cardiovascular diseases. However, she is also skilled at using methods that have proven effective in the past, such as the exercise treadmill stress test, nuclear myocardial perfusion scans, and peripheral vascular duplex. Dr. Chen has received additional training as a vein specialist and performs radiofrequency ablation within the facility.  

Dr. Chen is committed to helping patients receive the care and attention they need. By combining the latest technology with her knowledge and pleasant demeanor, she can make patients feel confident that they are in the best care possible. To receive professional attention for any issue concerning the heart, make an appointment with Dr. Chen online or by phone today.

Dr. David Lau received his Medical Degree and PhD degree in Physiology and Biophysics from NYU School of Medicine.   He completed his entire clinical training in Internal Medicine, Cardiovascular Disease, and Clinical Cardiac Electrophysiology at Columbia University - Presbyterian Medical Center.   Dr. Lau specializes in general cardiology and is an expert at the diagnosis of electrophysiological disorders and management after pacemaker, defibrillator, and remote cardiac monitor implantation.   Dr. Lau has presented his research at national meetings and published extensively in the area of electrophysiology.   He has a particular interest in the management of syncope and palpitations.   Dr. Lau is multi-board certified in Internal Medicine, Echocardiography, Cardiovascular Diseases, and Clinical Cardiac Electrophysiology and is Registered in Vascular Interpretations.

Arsalan Rehmani, MD, FACC, FSCAI is an Interventional and General Cardiologist at Chinatown Cardiology P.C. Dr. Rehmani completed his residency at BronxCare Health System followed by subspecialty fellowships in cardiology and interventional cardiology at Mount Sinai Morningside Hospital. He is board-certified in multiple subspecialties including Internal Medicine, Cardiovascular Disease, Interventional Cardiology, Adult Echocardiography, Nuclear Cardiology, Endovascular Medicine, and Cardiac CT.



Dr. Rehmani accepts new patients, and he currently provides consultations at various locations in New York City, including the Upper West Side and Chinatown in Manhattan, Queens, Brooklyn, and the Bronx. Dr. Rehmani is multilingual, being fluent in English, Urdu, Hindi, Russian, and Ukrainian.

Michael Liou, MD, FACC, FSCAI, is a skilled, board certified interventional cardiologist practicing at Chinatown Cardiology P.C., which has locations in Flushing, Brooklyn, Chinatown, and the Upper West Side of Manhattan. 

Dr. Liou earned his medical degree from SUNY Stony Brook School of Medicine after completing the prestigious Sophie Davis Biomedical Education Program at CUNY City College. He completed his internship and residency in internal medicine at NYU Langone Medical Center and performed his fellowship training in cardiovascular disease at Beth Israel Medical Center (now known as Mount Sinai Beth Israel) and returned to NYU Langone Medical Center for his advanced interventional cardiology subspecialty fellowship. 

Although he provides care for all cardiovascular conditions, Dr. Liou’s clinical expertise is in performing transradial cardiac catheterization, peripheral endovascular intervention, percutaneous mitral & aortic valvuloplasty, and ASD/PFO closure. He continues to participate in clinical research with a special focus on cardiovascular diseases affecting Asian Americans. 

Dr. Liou is multi-board certified in cardiovascular diseases, echocardiography, nuclear cardiology, and interventional cardiology.

Medical Compass MD, led by David Dunaief, MD, is an integrative, functional, and lifestyle medicine practice with offices in Brooklyn Heights, Brooklyn, in New York City and in Setauket, New York, on Long Island.

Dr. Dunaief takes a plant-based approach to wellness as derived through nutritional medicine and lifestyle interventions that reverse, prevent and treat chronic disease. He takes an individualized approach to care, using cutting-edge medical research to guide his decision making.  

Medical Compass MD specializes in chronic care management, providing integrative medicine treatments for conditions like autoimmune disorders, diabetes, migraines, and heart disease. 

With a focus on preventive medicine, Dr. Dunaief’s integrative approach uses the low inflammatory foods every day (LIFE) diet — a plant-based, nutrient-dense, whole-foods approach to health and wellness.

Dedicated to improving health care for all, the practice produces cutting-edge research on the LIFE diet that has been published in peer-reviewed medical journals.

At Medical Compass MD, the focus is on reversing, treating, and preventing chronic disease by connecting conventional medicine with lifestyle modifications. This approach gives patients the ability to take a more proactive role in managing their own health.

For evidence-based medical care for optimal health, call Medical Compass MD or request an appointment online today.

Igor Chernyavskiy, MD, is a top-ranked pulmonologist and sleep medicine specialist providing patients in Brooklyn, NY 11235 with one of the best and unparalleled levels of care for an array of acute and chronic lung conditions and diseases and sleep disorders.

Dr. Chernyavskiy earned his medical degree at Krasnoyarsk State Medical University in Russia, followed by a residency in internal medicine at Monmouth Medical Center in Long Branch, NJ, and a fellowship in pulmonary care at the State University of New York (SUNY), Stony Brook.

He maintains active memberships in many medical societies including the American Academy of Sleep Medicine, the American Thoracic Society, and the American Medical Association, and is board-certified by the American Board of Sleep Medicine and by the American Board of Internal Medicine in critical care, pulmonary disease, and sleep medicine. In addition to seeing patients at his private practice, Dr. Chernyavskiy maintains hospital affiliations with Stony Brook University Medical Center and the VA Medical Center in Northport.

Dr. Chernyavskiy welcomes new patients and accepts most major insurance plans. He speaks both English and Russian.

Natalie Marks, MD, is a board-certified vascular surgeon who serves the community of Borough Park in Brooklyn, New York, at the Vascular Institute of New York. With more than 25 years of experience, Dr. Marks is passionate about using the latest advancements in medical technology to diagnose and treat a wide range of vascular conditions, including hypertension, peripheral arterial disease (PAD), venous leg ulcers, and diabetic vascular disease.

Growing up in Ukraine, Dr. Marks earned her Medical Doctorate from Crimea State Medical University in Simferopol, Ukraine. She later moved to the United States to complete her internal medicine residency at Maimonides Medical Center in Brooklyn. 

Dr. Marks is certified by both the American Board of Vascular Medicine and Internal Medicine. She also holds certifications from the National Alliance of Wound Care and Ostomy and in Diagnostic Medical Sonography (RDMS) for vascular technology.

In addition to her time at the Vascular Institute of New York, Dr. Marks is an attending physician at Brooklyn’s Maimonides Medical Center, New York Community Hospital, and NYU Langone Brooklyn Medical Center. She also belongs to a number of professional organizations, including the American College of Physicians and the American Society for Vascular Medicine.

Click here to read Dr. Natalie Marks' online profile.

Dr. David Lau received his Medical Degree and PhD degree in Physiology and Biophysics from NYU School of Medicine.   He completed his entire clinical training in Internal Medicine, Cardiovascular Disease, and Clinical Cardiac Electrophysiology at Columbia University - Presbyterian Medical Center.   Dr. Lau specializes in general cardiology and is an expert at the diagnosis of electrophysiological disorders and management after pacemaker, defibrillator, and remote cardiac monitor implantation.   Dr. Lau has presented his research at national meetings and published extensively in the area of electrophysiology.   He has a particular interest in the management of syncope and palpitations.   Dr. Lau is multi-board certified in Internal Medicine, Echocardiography, Cardiovascular Diseases, and Clinical Cardiac Electrophysiology and is Registered in Vascular Interpretations.

Michael Liou, MD, FACC, FSCAI, is a skilled, board certified interventional cardiologist practicing at Chinatown Cardiology P.C., which has locations in Flushing, Brooklyn, Chinatown, and the Upper West Side of Manhattan. 

Dr. Liou earned his medical degree from SUNY Stony Brook School of Medicine after completing the prestigious Sophie Davis Biomedical Education Program at CUNY City College. He completed his internship and residency in internal medicine at NYU Langone Medical Center and performed his fellowship training in cardiovascular disease at Beth Israel Medical Center (now known as Mount Sinai Beth Israel) and returned to NYU Langone Medical Center for his advanced interventional cardiology subspecialty fellowship. 

Although he provides care for all cardiovascular conditions, Dr. Liou’s clinical expertise is in performing transradial cardiac catheterization, peripheral endovascular intervention, percutaneous mitral & aortic valvuloplasty, and ASD/PFO closure. He continues to participate in clinical research with a special focus on cardiovascular diseases affecting Asian Americans. 

Dr. Liou is multi-board certified in cardiovascular diseases, echocardiography, nuclear cardiology, and interventional cardiology.