Dan Conlon Brennan, MD
Nephrology
The Johns Hopkins Hospital
600 N. Wolfe Street, Carnegie Building, Suite 668 A
Baltimore, MD 21287 Directions
4.9 out of 5
35 verified ratings
35 Ratings, 18 Comments
The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy.
Jun 18, 2026
Very impressive!
Jun 18, 2026
Very knowledgeable and easy to talk to. Explains complicated information so a patient can really understand.
Jun 18, 2026
Greatly appreciated his knowledge and interest
Apr 6, 2026
A doctor of great vision and experience in his field
Apr 6, 2026
Dr Brennan is a very attentive, knowledgeable, and professional doctor . I am glad he is my transplant doctor .
Mar 30, 2026
Outstanding
Mar 4, 2026
Provider took the time to explain things to me .
Mar 4, 2026
Professional, respectful and explained things to me
Mar 4, 2026
Active very professional, they gave me advice about Medication list
Feb 16, 2026
Dr Dan Brennan is the best doc you could ever hope for extremely knowledgable and very professional. Hpkins is lucky to have him as am i. [staff] and his whole team are the best thank you.
Dec 30, 2025
Very kind and patient with explaining medical terms.
Dec 3, 2025
Dr Brennan is very knowledgeable and I feel very confident in the next steps for my health. He answered all my questions and explained the whys. He's a very kind doctor.
Nov 25, 2025
Very good person, attentive, respectful, cordial when knowing how to express and communicate with his patient.
Nov 25, 2025
Very useful for my needs and concern
Nov 12, 2025
Gained rich knowledge from the doctors and the whole medical team about my health condition
Oct 21, 2025
Wonderful!
Oct 10, 2025
Love Dr Brennan. He is the reason why I travel from northern VA to Baltimore to be seen.
Oct 7, 2025
Hi is very knowledgeable and very up to date.