What patients are saying
Overall rating
4.95
Average wait time
4.39
Bedside manner
4.96
“I've been seeing Dr. Jackness for many years, and he is knowledgeable and personable, always trying to make sure I understand what's going on with my health issues. The rest of the team is also friendly and competent, and especially helpful if any issues come up with other providers. I will definitely continue seeing Dr. Jackness for the foreseeable future.”
Marshall B.February 8, 2026
“Dr Jackness was incredibly helpful and a great communicator …excited and grateful that he will be my doctor going forward.”
Georgio K.February 2, 2026
About Dr. Clifton Jackness
Dr. Clifton Jackness is an endocrinologist treating patients in New York City, and the surrounding communities. He holds certification from the American Board of Internal Medicine in internal medicine and endocrinology, diabetes, and metabolism. He is also a member of professional organizations including the American Medical Association, the Endocrine Society, the New York County Medical Society, and the American Association of Clinical Endocrinologists.
For his undergraduate degree, Dr. Jackness attended Yale University, where he studied music. He pursued his medical degree at the Albert Einstein College of Medicine. Dr. Jackness continued his medical education at the Mount Sinai Hospital. Here, he completed an internship program and received residency training in internal medicine. Dr. Jackness has also completed a fellowship program in endocrinology at Columbia University.
Patients visiting Dr. Jackness can receive treatment for a full range of endocrine issues. He provides general consultations, osteoporosis evaluations, and treatment for issues including goiter, hair loss, diabetes, thyroid problems, adrenal problems, obesity, and pituitary problems. In addition to his clinical roles, Dr. Jackness has been active in research on topics including obesity and type 2 diabetes.
Areas of expertise
This doctor's experience enhances their expertise in similar cases. Below are the conditions or surgeries they treat most frequently.
Diabetic emergency
Problems with testicular function
Parathyroid gland disorder
Osteoporosis
Overactive thyroid
Chronic diabetes
Diabetic emergency
Problems with testicular function
Parathyroid gland disorder
Osteoporosis
Office location
Education and background
Practice names
Board certifications
- Endocrinology, Diabetes & Metabolism (American Board of Internal Medicine)
Education and training
- Medical School - Albert Einstein College of Medicine of Yeshiva University, Doctor of Medicine
- The Mount Sinai Hospital, Residency in Internal Medicine
- NewYork-Presbyterian Hospital / Columbia University Medical Center, Fellowship in Endocrinology, Bone Disease, Diabetes, and Metabolism
Professional memberships
- Endocrine Society
- American Association of Clinical Endocrinologists
- New York Thyroid Club
Awards and publications
- Castle Connolly Top Doctor
Languages spoken
- English
- Spanish
Provider's gender
Male
NPI number
1346402716
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
4.95
Wait time
4.39
Bedside manner
4.96
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
1109 reviews
Most relevant
Dr Jackness was incredibly helpful and a great communicator …excited and grateful that he will be my doctor going forward.
February 2, 2026Georgio K.Verified patient
Best endoncrologist I ever had, and I did try many. Very knowledgeable, friendly and caring, up to date with research.
September 5, 2025Ana R.Verified patient
I highly recommend Dr. Jackness. He is caring, thoughtful and thorough. I feel very fortunate to have him as my physician.
Less than 1 year agopatricia F.Verified patient
Dr. Jackness is thorough, knowledgeable and has a great bedside manner. An absolute pleasure
January 22, 2026Scott B.Verified patient
I couldn’t ask for a more professional, knowledgeable and caring doctor!
March 23, 2026Marylou B.Verified patient
One of the best physicians I have ever seen in my life, cannot recommend highly enough!
November 8, 2025Hamdan A.Verified patient
Dr. Jackness does not take insurance, and he’s worth every penny.
December 16, 2025Beth K.Verified patient
The dr and staff are amazing! You can tell they really care for each individual person. I’m so happy I found this Dr.
February 9, 2023Sonia C.Verified patient
Dr. Jackness is knowledgeable, thorough and easy to talk to. I have consistently had an excellent experience in his care.
May 27, 2020Nancy M.Verified patient
Dr. Jackness is the Best!!! He is Very Knowledgable and Very Kind!! I Highly Recommend him. His Office Staff are Wonderful!!!
November 23, 2016Joseph M.Verified patient
As usual Dr. Jackness answered in detail all my questions. I like his professionalism as well as the appointment efficiency.
May 27, 2016Madalina M.Verified patient
He was knowledgeable, attentive, got back to me by phone when I had prescription questions. Overall a terrific experience!
August 4, 2020Lisa Y.Verified patient
Extremely smart, incredibly caring and kind, Dr Jackness is everything you could possibly want and need in a physician.
July 15, 2020Andrea W.Verified patient
Most thorough and most thoughtful endocrinologist in NYC (for decades!)
September 27, 2025Francesca W.Verified patient
Dr. Jackness is a very caring doctor. Friendly and professional. He is very responsive and works to help me feel my best.
More than 1 year agoWendy W.Verified patient
It was a wonderful visit. All of my questions and concerns were answered. I am confident in his assessment of my problem.
May 21, 2020Hope N.Verified patient
Dr. Jackness is intelligent and finds good solutions to issues while talking at the level of the patient's understanding.
November 3, 2016William M.Verified patient
Dr. Jackness is a very good doctor. He gives a lot of attention to the patient health problem. I highly recommend him.
More than 1 year agoInitials hidden
Dr. Jackness was very friendly and professional. He explained everything thoroughly and was patient with my questions.
August 28, 2014Carolyn R.Verified patient
Discussed blood analysis and the meaning. Dr. Jackness explained the results patiently, understandably, and carefully.
May 5, 2020William M.Verified patient
Dr. Jackness is such a thoughtful doctor! The wait was a bit longer today but they were busy at the start of the year
January 2, 2019Cody P.Verified patient
He was very knowledgable and thorough. He took his time and answered every question I had. I did not feel rushed.
September 12, 2014Initials hidden
Dr Jackness has an excellent beside manner and always takes time with patients so as to not rush through a diagnosis
June 8, 2017Linda C.Verified patient
It is always a pleasure to see Dr. Jackness. Even though the office was extremely busy I had quality time with him.
December 7, 2016Sandra M.Verified patient
Dr. Jackness is very thorough and personable and is helping to keep me on track in controlling my Type II Diabetes.
April 25, 2018Michael W.Verified patient
As usual - Prompt, service. Professional Staff. Caring and courteous Nurses and Doctor - what more can one ask for!
May 4, 2016Evette R.Verified patient
First appointment with Dr. Jackness. He was extremely knowledgeable, professional and pleasant. Highly recommended.
December 1, 2014Initials hidden
Great visit as always. Dr. Jackness always takes the time to explain things to me in a way that I can understand.
January 30, 2019Jeffrey P.Verified patient
HE IS PATIENT, LISTEN ATTENTIVLY, EXPLAINS ANY QUESTION A PATIENT MAY HAVE. HE DOESNT RUSH ONE OUT THE OFFICE
July 16, 2020Patricia J.Verified patient
Crowded waiting room. Seems to order many, excessive procedures not previously ordered by other endocrinologists.
More than 1 year agoInitials hidden
Dr. Jackness and his knowledge gave me my life back. Fantastic doctor with great bedside manner. Highly recommend!
More than 1 year agoAllison T.Verified patient
Dr. Jackness was humble, professional ,
patient--explained everything and answered all my questions.
Maureen
November 30, 2016Initials hidden
Always a pleasure seeing Dr. Jackness. Great doctor with the patient's need as priority. Awesome bedside manner.
September 12, 2018Ming J.Verified patient
Dr Jackness is not one to rush into operations, an attitude I like. He explains situations and options clearly.
July 17, 2019Robert P.Verified patient
Amazing. He's a great doctor, super informative, professional and friendly. I would highly highly recommend him!
More than 1 year agoInitials hidden
I was extremely pleased, he listened, went over the medical record with me, and we agreed on a plan of action.
August 24, 2020Maria B.Verified patient
I am starting my tratament for hipotireoidism and lose weight.
August 20, 2025Lidi L.Verified patient
Efficient. He took time to answer all questions. Office performed relevant tests. Very informative. Great Doc!
June 25, 2019Sonia D.Verified patient
Dr. Jackness is one of this world’s very best physicians and moreover he is an amazing and wonderful person.
November 20, 2017Salomon V.Verified patient
I've been seeing hime for 3 years. Couldn't be happier. I'm so appreciative of his care, and his office staff.
More than 1 year agoSusan B.Verified patient
Clifton is a caring, knowledgeable, responsible and awesome endo!
Less than 1 year agoInitials hidden
Very knowledgeable. Takes time to talk to you and answer questions. Would definitely recommend him to others.
More than 1 year agoInitials hidden
short wait, but staff is so nice, and Jackness always the best. so the wai never really bothers me
More than 1 year agoInitials hidden
He is the Best Endocrinologist, he always takes his time to review and explain results. I never feel rushed.
November 28, 2016Adalgisa P.Verified patient
This doctor is amazing! I really feel like he knows what what he is doing. He has helped me a lot thus far.
More than 1 year agoInitials hidden
Perfect start. Great experience. Seen, heard and supported.
August 6, 2025Deborah H.Verified patient
Dr. Jackness was fantastic! He was through, caring, and kind, and he listened and address all my concerns.
More than 1 year agoInitials hidden
Professional & focused on my issues. Spent as much time as was necessary to respond to all of my concerns.
January 26, 2016Joel J. S.Verified patient
He carefully explains the findings of his complicated specialty, which he knows very well. A fine doctor.
April 17, 2014Initials hidden
Dr. Jackness was very friendly, explained my condition very well. The staff are very patient and friendly.
More than 1 year agoRS
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Generally, Dr. Clifton Jackness has appointments available on Zocdoc within 1 week. You can see Dr. Jackness's earliest availability on Zocdoc and make an appointment online.
Is Dr. Clifton Jackness accepting new patients?
Dr. Clifton Jackness generally accepts new patients on Zocdoc. You can see Dr. Jackness's earliest availability on Zocdoc and schedule an appointment online.
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Can I make an appointment with Dr. Clifton Jackness online?
Yes, you can make an appointment online with Dr. Jackness using Zocdoc. It’s simple, secure, and free.
What practice does Dr. Clifton Jackness work with?
Where is Dr. Clifton Jackness's office located?
Dr. Clifton Jackness's office is located at 103 E 75th St, New York, NY 10021.
Which board certifications does Dr. Clifton Jackness have?
Dr. Clifton Jackness is certified by Endocrinology, Diabetes & Metabolism (American Board of Internal Medicine).
What are common reasons for patients to see Dr. Clifton Jackness?
Dr. Clifton Jackness frequently sees patients for Acne, Birth Control / Contraception, Endocrinology Consultation, Hair Loss, and Weight Loss Consultation. You can see other visit reasons for Dr. Clifton Jackness on their profile.
What languages does Dr. Clifton Jackness speak?
Dr. Clifton Jackness speaks English and Spanish.
How do patients rate Dr. Clifton Jackness in reviews?
1109 patients have reviewed Dr. Clifton Jackness. The overall rating for this doctor is 4.95/5. They have a 4.96/5 rating for bedside manner and a 4.39/5 rating for wait time. You can read individual reviews and ratings on their profile.