Locations: Danbury, Ridgefield
Dr. Jay Klarsfeld is a practicing ENT physician specializing in Head & Neck surgery, Thyroid & Parathyroid surgery, and Closed Rhinoplasty. He is a resident of Ridgefield and sees patients at our Danbury & Ridgefield offices.
Undergraduate studies:
Brandeis University
Medical school:
Mount Sinai School of Medicine
Residency:
Mount Sinai Hospital
Fellow:
American Academy of Otolaryngology – Head and Neck Surgery
Member:
American Rhinologic Society
Member:
New York Facial Plastic Surgery Society
Member:
Alpha Omega Alpha Medical Honor Society
Dr. Klarsfeld has received numerous Top Doctor awards including:
- Top Doctors: New York Metro Area (book series): 6th, 7th, 8th, 9th. 10th, 11th, 12th, 13th, 14th, 15th, 16th, 17th, 18th and 19th Edition
- Connecticut Magazine Connecticut Top Doctors | Moffly Media Magazines Fairfield County Top Doctors: 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
- Top Doctors: New York Metro Area (digital guide): 2016, 2017, 2018, 2019, 2020, 2021
- America’s Most Honored Doctors | The American Registry: 2021, 2022
























Dr. Klarsfeld did an amazing job walking me through the septoplasty process and did an amazing job making me able to breathe again


Everyone at Advanced Specialty Care from check-in/check-out personnel to nurses and Dr. Jay Klarsfeld are beyond awesome. I had to have 2 separate nasal procedures with many follow up appointments and am very happy I chose this practice and highly recommend them.


In 2022 , I had an MRI of my brain. The results were negative, but unexpectedly showed a growth both at the base of my tongue and on my thyroid. I had my results sent to my ENT, Dr. J. Klarsfeld. Puzzled by this, , he ordered a series of tests, including Ultrasound and biopsies of both growths. It was through Dr Klarsfeld’s determination and perseverance that I was diagnosed with an ectopic thyroid …a very rare occurrence that begins in utero. I am forever grateful to Dr. Klarsfeld for his persistence in finding this diagnosis and has my utmost respect for his dedication and compassion to his patients. I highly recommend him.


Excellent!


My concerns were alleviated, and a course of treatment recommended. I have follow-up appointment in January. Thank you.


Dr. Klarsfeld and the entire staff were wonderful. I couldn’t breathe out of the left side of my nose for most of my life, and he really opened up my nasal passages. It was life changing!


Great experience all around 10/10 would recommend


Dr. Klarsfield is the best doctor I’ve had for treating my nose and throat issues. I had a few surgeries with him and it’s always nice and smooth, great bedside manners. He is a phenomenal doctor who truly cares and shows it. 🥰


Smart, friendly, and knowledgeable, I got the impression that he actually listened to me and did not just come up with snap easy answers. What more, his answer is not to simply add more medications and/or procedures, but rather review some of the treatments I am on and determining if they are really needed. Filled me with confidence and I would highly recommend.


I first came into Dr. Klarsfeld’s office with about 80% of my left septum blocked due to it being deviated. Since day one I’ve been shown nothing but absolute professionalism & respect from him & his team. Dr. Klarsfeld performed my septoplasty on 9/17 and ever since my life has changed for the better. Pre surgery my breathing was being affected negatively during exercise, sleep, and it was hindering my everyday life. Thanks to Dr. Klarsfeld & his wonderful team I can breathe again through my nose with 0 issues. For the people out there that need any sort of ENT help, I 100% recommend seeing Dr. Klarsfeld. He is the best doctor I’ll ever meet by far and I will never forget how he changed my life.


Had my septorhinoplasty done by Dr. Klarsfeld and had an amazing healing process and very natural results.


Highly recommend, professional and very informative throughout my whole pre and post septoplasty


Dr. Klarsfeld did an amazing job. He is a very outstanding doctor, he fixed both my nose and my son’s nose, inside and out. Both results were 10/10 as we breathe much better. 10/10 highly recommended.


My experience with Dr. Klarsfeld was excellent. He took his time to thoroughly answer all of my questions. Appointments were kept on schedule, and the office staff was friendly and professional.


Dr. Klarsfeld your office is a true pleasure to deal with from scheduling the appointment to the check out process. I felt respected and valued as a patient. This is a well organized facility and I wish other practices would follow your lead!


Dr. Klarsfeld was phenomenal! I had a severely deviated septum and had already been through one unsuccessful surgery, so I was understandably hesitant to try again. The first time was all pain with no reward. But Dr. Klarsfeld’s calm and confident approach gave me the reassurance I needed. He was upfront—it was a challenging case—but he delivered. The results speak for themselves. Thank you, Dr. Klarsfeld! My breathing is better, and according to my wife, so is my face.


super kind and gave me a realistic idea of what my recovery would look like, very greatful!


I’ve been going to Dr. Klarsfeld for over 20 years and I give him 5 stars every time I go! His staff is quick, friendly and efficient. Dr. Klarsfeld is very thorough and gets right down to business as far as finding out what the problem may be and the direction of treatment serves you the best!


Thank you Dr. Klarsfeld for diagnosing and treating my chronic cough. Outstanding diagnostician and very nice too!


Klarsfeld was professional with solid bedside manner. Already feeling better after my nasoplasty.


On time, pleasant, professional and communicative.


Dr Klarsfeld has been our family ENT specialist for 23 years, we would not even think of going to anyone else. He truly is THE BEST in every way. We are 150% confident in his care and we’re very highly recommend him for children and adults.


Professional, friendly, and thorough


Dr. Klarsfeld is fantastic. He provided me excellent care. Both in office & through thyroid surgery. Highly recommend him and his staff.


I cannot speak highly enough about Dr. Jay Klarsfeld and the exceptional care he provides. From the moment I stepped into his office at Advanced Specialty Care, I felt confident that I was in the hands of a knowledgeable, compassionate, and deeply experienced professional. Dr. Klarsfeld takes the time to listen attentively, explains every aspect of diagnosis and treatment in clear, understandable terms, and genuinely prioritizes patient comfort and outcomes. His calm demeanor and meticulous attention to detail immediately put me at ease. It’s clear he brings decades of experience to each consultation, and his dedication to excellence is evident in every interaction. The entire process—from initial evaluation through treatment and follow-up—was smooth, efficient, and handled with the highest level of professionalism. The office staff and clinical team also reflect his standard of excellence. If you’re looking for an ENT specialist who combines expertise, integrity, and genuine care for his patients, Dr. Klarsfeld is the gold standard. I’m grateful to have found him and would recommend him without hesitation to anyone seeking top-tier care.


Had my tonsils and adenoids removed by Dr. Klarsfeld in early May. Great experience and I feel great just a little over a month post op.


Dr. Klarsfeld was great and a pleasure to have as an ENT doctor. He’s very personable and caring. I had Deviated septum surgery and it went smoothly. I followed his post surgery instructions and healed quickly. If you need an ENT doctor, I would recommend you call him.


For years my daughter has struggled wuth chronic ear infections and ear pain, as well as severe sleep apnea and asthmatic tendencies. Once we got Dr.Klarsfeld, he wanted to get to the cause of the issues rather than just medicating the symptoms. He knew just what to do and sent us for a sleep study, then performed a tonsillectomy, and Mt daughters health has never been better. She now sleeps soundly through the night and has not had an ear infection sense. 5/5 stars, definitely recommend Dr.Klarsfeld’s professionalism and expertise to anyone in need.


Great doctor- very attentive and respectful. Overall, very happy!


Doctor Klarsfeld took his time& answered all my questions & concerns


Dr. klarsfeld helped fix my GERD and made me feel very safe and comfortable throughout the process. Highly recommend!


Dr. Klarsfeld was excellent and has me feeling better than ever. Services were quick, thorough, and effective. Dr. Klarsfeld was very attentive and encouraged me to reach out with any questions should they come up. Additionally, after experiencing discomfort, Dr. Klarsfeld made an effort to see me multiple times after my procedure to make sure everything was okay


I was suffering for years with debilitating sinus headaches. Dr Klarsfeld diagnosed me as having polyps and scar tissue in my sinuses. He removed them surgically and I feel like a new person now that I am no longer in chronic pain. Everyone in the office is professional and friendly, I highly recommend Dr Klarsfeld and his staff.


Dr Klarsfeld has been amazing. He explains everything very clearly and I am feeling so much better. He is very thorough! He is also very nice with great ‘bedside manner’. I would absolutely recommend him!


I’ve been seeing Dr. Klarsfeld for years. He is the best!


I had a excellent experience with Dr Klarsfeld, he answered all my questions, and calm me down about my thyroid cancer, that I was gonna be okay. Is been almost 3 months since my surgery and I’m doing really good.


Dr. Klarsfeld is truly an amazing doctor! He has incredible bedside manner, so knowledgeable, takes his time with his patients… he’s very personable and was a pleasure to work with.


I had a deviated septum repaired by Dr. Klarsfeld in January 2025. Dr. Klarsfeld did a great job in the operating room, and an equally great job before and after the procedure. He explained in detail what needed to be done and how he was going to do it. He also explained how the recovery was going to go, so I wasn’t worried about potential complications. I appreciated his confidence that I would have a successful outcome, since I was fairly nervous. The result is a dramatic improvement in my breathing. I highly recommend Dr. Klarsfeld for any ENT related problems.


Excellent care and attention during my office visit.


My experience with Dr.Klarsfeld was very good since the beginning he explained everything to me every single step, after surgery and post operation I can say he is the best I can breathe very good now plus my nose looks very cute and everything thanks to him. This is how my nose looks like now and I LOVE IT Thanks you Dr Klarsfeld:)


I’ve been seeing Doctor Klarsfeld for a little over two years now. He is a conscientious and knowledgeable practitioner with decades of experience. He is a patient listener who takes the time to understand your questions and concerns. I recommend him to anyone who is in need of his services


Excellent human being. Extremely kind and did an amazing job on my nose. 10/10 expierence an final results.


Professional, prompt, with consistent follow through. Overall positive patient experience.


I had a septoplasty done by Dr. Klarsfield and I can breathe very well now! Thank you!


Dr. Klarsfeld fixed my deviated septum, and now for the first time I can recall, both of my nostrils work equally well! I can’t thank him enough. He did a wonderful job! This is a huge improvement to my quality of life. I highly recommend Dr. Klarsfeld!


I was impressed by the knowledge and proficiency of each staff member especially the Doctors that I had the pleasure to speak to. I would highly recommend this office to others that need great physician’s and accommodating staff, thank you!


Friendly, professional and informative. Dr Klarsfeld helped me feel comfortable and hopeful with regards to my hearing.


Dr Klarsfeld did a fantastic job on my son’s nasal problem. His diagnosis was spot on. Our insurance was not so cooperative in agreeing that surgery was required. They denied the doctor’s request for approval and insisted that my son go through additional rounds of taking antibiotics and other treatments that did not work. Dr Klarsfeld was finally able to get the insurance approval and now my son is no longer suffering as he was for years. Thank you Dr Klarsfeld!!


Awesome! Understand.. straight to the point.. definitely recommend him to others!


I really enjoyed my visit with Dr. Klarsfeld, he was a true professional. He made me feel comfortable while explaining everything during my visit.
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