Geoffrey Sonn

Urologic oncologist, Urologist, Urologic specialist, Genitourinary specialist, Urologic surgeon

Associate Professor of Urology and, by courtesy, of Radiology (Body MRI)

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Geoffrey Sonn, MD is a board certified urologist who specializes in treating patients with prostate and kidney cancer. He has a particular interest in cancer imaging, MRI-Ultrasound fusion targeted prostate biopsy, prostate cancer focal therapy, and robotic surgery for prostate and kidney cancer. He was the Stanford principal investigator of a major clinical trial using MRI-guided focused ultrasound to treat prostate cancer. The goal of this trial was to treat prostate cancer with fewer side effects than surgery or radiation.

Dr. Sonn was born in Washington State and lived there until leaving for college at Georgetown in Washington DC. After graduating magna cum laude at Georgetown he returned to the West Coast for medical school at UCLA. Following medical school, Dr. Sonn completed a 6-year urology residency at Stanford where he developed particular interests in the clinical care of patients with urologic cancers and research in cancer imaging. He then spent two years at UCLA as a urologic oncology fellow where he devoted all his time to gaining additional skills and experience in clinical care and research in urologic malignancies. Since finishing his fellowship, Dr. Sonn has been at Stanford where he applies the skills he gained in residency and fellowship to provide high-quality clinical care to patients with urologic cancers. Dr. Sonn also continues to work to develop new methods to better diagnose and treat urologic cancers through research. His primary research focus is in prostate cancer focal therapy and developing artificial intelligence methods to improve prostate cancer detection on MRI and ultrasound.

Professional Summary

Professional Education
  • Residency: Stanford University Medical Center (2011) CA
  • Residency: Stanford University Medical Center (2007) CA
  • Medical Education: UCLA David Geffen School Of Medicine Registrar (2005) CA
  • Fellowship: UCLA David Geffen School Of Medicine Registrar (2013) CA
  • Board Certification: American Board of Urology, Urology (2015)

Honors & Awards
  • CaPSURE Scholars Program, UCSF Department of Urology (2008)
  • First Place in Localized Kidney Cancer Poster Session, American Urological Association (2010)
  • First Place in Prostate Cancer Detection & Screening Poster Session, American Urological Association (2013)
  • First Place Resident essay contest, Western Section AUA (2008)
  • Mahoney Medal (Outstanding pre med with a liberal arts major), Georgetown University (2001)
  • Research Award for Fluorescent Imaged Guided Surgery in Prostate Cancer, Longmire Surgical Society at UCLA (2013)
  • Richard K. Lo Resident Publication Award, Stanford Urology (2010)
  • Third Place Resident Essay Contest in Clinical Research, American Urological Association (2009)


Practice Locations

Urologic Cancer Program in Palo Alto Palo Alto, CA
Palo Alto, CA

875 Blake Wilbur Drive

Palo Alto , CA 94304

(650) 498-6000

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Urologic Cancer Program in San Jose San Jose, CA
San Jose, CA

2589 Samaritan Drive

San Jose , CA 95124

(650) 498-6000

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Cancer Center in South Bay San Jose, CA
San Jose, CA

2589 Samaritan Drive

San Jose , CA 95124

(833) 444-7622

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Patient Ratings

(147 Ratings)

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Patient Reviews

(204 reviews)

Best doctor and staff through out the process
I found Dr Sonn to be personable, knowlegeable, and well able to clearly explain the situation and options to me. He made a difficult time much easier and less stressful, and I'm grateful to him.
Dr. Sonn was patient and took his time to explain everything to me, answer all of my questions, and tell me what referrals he was going to send me for my next steps. He also had reviewed my case and was knowledgeable of my medical situation. There's nothing else I could have asked for from the consultation or from Dr. Sonn. Very satisfied.
Lots of good communication before the visit and during the visit.
Easy to talk to, explained options well. Seems like he will be accessible if I need help.
The staff from the time we walked in the door and Dr Sonn and his team were all very helpful and efficient, and everyone made me feel comfortable with the procedure I had.
Great doctor. don’t schedule the doctors so tightly.
I now understand my cancer and prostate issue better than I had over the last few years. He had the time to explain and answer questions, made me feel comfortable I was getting the straight scoop. I’d been told he was the guy to work with by a good friend who is one of his HIFU patients. My situation is different, and options and some opinions were put on the table to me. I told him my local urologist’s plan, and he very professionally told me what his would be.
Great doctor. Thank you
I have a very good impression.
Dr. Sonn provided his usual excellent care!
Liked Dr Sonn very courteous
He is caring, knowledgeable and confident. I feel in good hands. My situation has is ambiguous because of lack of concordance with lab results and the implications are a range of possibilities, not definitive answers. . He explained the range of possibilities, gave his best judgment of what that means, with some qualifications allowing for other outcomes. He suggested a general course of action, allowing me to choose between specific procedures.
Dr. Sunn should wear a cape.
Everyone, from reception, to the nurse at checkout, has excellent bed-side manner.
Staff are great, provided clear explanations of each step of procedures
He is an excellent doctor and explain my case well.
I want to thank Dr. Sonn for his thorough discussion of the treatment options available for my cancer treatment.
Very professional
I was quite impressed. He was knowledgeable and explained things well. I have lots of confidence in his recommendations.
Thank you!
Dr. Sonn is a great doctor. He is very knowledgeable and cares for his patient. A great communicator.
Very thorough and thoughtful. I was so grateful for the time he spent discussing my case. No other senior dr has spent so much time or was so helpful. Very impressed!
I was impressed with the Stanford MyHealth app and the first visit with my Dr. was a good experience.
World Class
I would recommend Dr. Sonn to anyone in need of his expertise.
Very satisfied with information and visit.
Thank you very Dr. Sonn for taking the time to address my concerns and questions.
My first visit with Dr. Sonn I was impressed he took time to explain in detail the different options open to me. I didn't have many questions at this meeting but I feel better after hearing his answers. Dr. Lamonica is my Urologist in Ukiah and she highly recommended him and I have to agree with her.
Dr. Sonn is an excellent doctor who answered all my questions and devoted as much time as needed for me to ask questions.
Excellent experience by every measure.
Highly recommended and in turn I would highly recommend Dr. Sonn.
Video chat was extremely helpful. Thank you Dr. Sonn.
Warm, kind, asked many questions first and therefore was able to not only convey empathy but he also understood my priorities, tying his words into mine on the questionaire. By the way he answered, he conveyed concern, competence and humanity. He also began the discussion and ended it with a sense of hope for psitive outcomes. Ad he heard my concerns with surgery and/or non-invasive techniques. Lastly, he laid out next steps. Thank you.
Excellent and effective video visit.
Luv him🠷
I enjoyed speaking with him. Straight shooter.
Great doctor
He establishes confidence and competence.
Very informative visit thank you
I would have liked to have received a detailed briefing on the procedure, process, position that I'd be placed in, the number of samples to be taken, etc.
Very helpful
Great Physician
Very professional and listens well and communicates even better.
Good communication and explanation
Dr. Sonn was an absolute pleasure to speak with. He was pleasantly relaxed, yet at the same time,, he listened carefully, and was crystal clear with all aspects of our conversation.
Dr. Sonn was Easy to communicate and he put me at ease regarding our path forward.
Dr. Sonn was very well informed and able to answer my questions candidly. I know it can be challenging to provide care to another physician. I appreciate his expertise and willingness to provide care for a colleague.
He's been an excellent doctor for me, and I wold not hesitate to recommend him.
He was extremely thorough and helpful in his explanations, very professional, and he took his time to make sure I understood my options and situation as best possible.
He is empathetic and patient with lay persons. He seems to be knowledgeable about his craft and shares information with his patients.
I like him he was very clear in explaining everything to me. Excellent
Good, laid out details, volunteered a helpful referral.
He was excellent.
He was exceptional and what we would expect from Stanford. Doctor Sonn was thoughtful and really wanted to know about my story and situation before he continued with what he needed for me to know about myself medically. That was greatly appreciated. He was professional throughout the entire visit and made sure prior to finishing that we were good and gave us time to consider any questions., but, he had answered everything and we felt in good hands.
He was very professional and communicated well. All of my concerns and questions were addressed and answered.
Very informative
Very good interaction, answers questions completely and anticipates questions very well.
excellent service, thank you.
Dr. Son. Has a very good, straightforward way about him. He clearly has command of the field, but talks directly about findings and future expectations.
Dr. Was very helpful and professional. He explain everything very well.
I have great confidence in Dr. Sonn's assessment of my situation. And he should be warned, he should expect a couple follow-up questions as I consider future decisions. Thanks.
So relieved that he is able to do the procedure that I most wanted! Very, very confident, and relieved. Five thumbs up!! My wife was equally impressed with Dr Sonn.
Dr. Soon was very professional, personable, and informative. His communication and interpersonal skills are excellent. He conveys confidence in his knowledge and opinions.
Dr. Sonn was pleasant, professional, calm, and very helpful. I appreciate his time and the fact that he will seek a second opinion for me.
Seems very knowledgeable and kind.
Excellent doctor
I felt very comfortable during my conversation with him. The virtual nature of the visit did not significantly affect my visit.
Dr. Sonn was very prompt on the call, was very courteous, polite and answered all my questions to my satisfaction.
He did an excellent job in providing me a second opinion
Dr. Sonn is very knowledgeable about the condition for which I am receiving treatment.
Excellent Doctor. Very personable and easy to talk to.
Extremely thorough and helpful.
Thank you Dr.Sonn I would have preferred to see you in person. I could not understand some of the details. I hope that the physician you refer me to,will be able to see me.
Very clear conversation, I am confident with my upcoming procedure.
Excellent doctor; all questions answered.
Comprehensive discussion regarding my diagnosis and possible treatment options that was meaningful.
Obviously he is competent and communicates well. Dr. Sonn is representative of why I am willing to travel 4+ hours to get my care from Stanford versus providers nearer to me.
Very approachable. Began the session by asking what I hoped to accomplish then addressed those issues during the visit. Responded to additions questions I had that arose during the visit.
Great understanding and understandable physician
Very informative and answerd all question and shared addition info on next steps
Very personable, explains difficult situations in understandable terms. I was very impressed despite the circumstances
I appreciate all the information provided and the methodology it was presented
Dr Sonn was punctual, professional and prepared for our video conference. He was thorough and answered all questions directly and in a way I didn’t have to question what he said.
He's a great doctor.
I was impressed with Dr. Sonn and his ability to explain my situation in clear, understandable language. I feel very comfortable with him and his staff and will schedule surgery with his office asap.
I would not hesitate to recommend my doctor and his staff, and everyone else who worked with me too anyone.
Thorough, efficient and very informative.
Very friendly & knowledgeable!
Thank him for me, for caring.
Dr. Sonn was very comfortable to talk to
Excellent doc.
Extremely knowledgeable ... explains and listens well.
Thank you for your time and patience. Let me know (have your staff call) if the enhanced high res image is needed as I can make the trip up for that appointment right away. Have a great day
All is great
I was extremely pleased that Dr. Sonn spoke "patient" rather than a salesperson. I felt comfortable that he was interested in my well-being.
I was very impressed
Very knowledgeable, very helpful. Personable. It was a very good visit.
Thanks for your care and time.
I found it easy to discuss all relevant issues with him and he was clear in the points that he made.
Professional and a great communicator. Latter asset is a key benefit
Thank you for the time you spent with us and explaining everything. That was so informative.
Excellent doctor
Very professional and informative.
He's very approachable
Exellence and professional, good listener and very caring.
Dr. Sonn was awesome. My experience was made better by him and the staff.
Questions fully answered & with respect.
Dr. Sonn is a superior doctor who puts his patients first.
Dr. Sonn is great. Absolutely no pain during procedure. He explained every step.
Excellent doctor & supporting staff.
Very helpful, transparent advice.
All very good.
I saw Dr. Sonn very little.
Dr. Sonn is top notch. Very comprehensive in history taking, physical exam, case discussion, NOT hurried.
Dr. Sonn, his nurse and assistants were all wonderful.
Dr. Sonn was very thorough, explained everything clearly and took as much time as I needed.
My doctor is awesome.
Good Dr. Sonn allowed me to direct the visit at my pace even though it was an extra long visit. I felt I had all the info. I needed to make an informed decision about my treatment plan at the end of the visit.
Very grateful that the doctor has agreed to performing surgery on a man of my age.
Dr. Sonn is excellent!
I have many doctors at Stanford and Dr. Sonn is one of the best. He listens, because, he explains - Amazing doc.
Dr. John & his staff are the best!!
I like that the doctor has a scribe or aide to dictate office recording of what doctor's information, recommendations, & outcomes of visit. This helps,free up doctor that he can spend all focused time on the patient. He can connect with his patients by making eye contact. This allows patient to feel doctor compassionate & caring & support of decision making. The doctor can sit in close proximity, make eye contact & have all attention on patient & listen intently. "Focus" helps correct in communication.
Dr. Sonn is great!
Excellent - professional.
Very good very caring doctor.
Everyone was very friendly/helpful.
dr sonn is tops!
Highly recommend. He saved me from a late diagnosed prostate cancer.
Dr. Sonn is the best!!
They treated me too good.
doctor and the staff were great during operation
I keep using the word "professional" because it is very apt
Dr. Sonn was excellent & I left with confidence that I am in good hands.
Dr. is a very gentle, caring and very professional. Dr. Sonn is God sent!!!!!!!
Both in the clinic visit and in follow up, Dr. Sonn has been extremely responsive.
Dr. Sonn was amazing. He wanted me to know my options, eased my anxiety about prostate cancer. He answered my questions, went through my prescriptions, then he went through each of my current issues. So encouraging to have a Dr. who we could understand,who cared about my concerns,and he LISTENED.
Great experience. Dr. Sonn is a great physician.
very informative
Dr. Sonn is extremely competent & very generous with his time. I am very satisfied with his care.
Dr. Soon was very knowlegable and compassionate
Again, doctor and nurse/assistant were very courteous and professional at all times.
I recommend to everyone to go to Stanford, you folks are the finest!
Dr. Sonn is great
Dr. Geoffrey Sonn is outstanding. I feel in excellent hands as his patient.
The Doctor was very patient with my questions. I did not feel rushed by the Doctor. He was sure that my concerns were addressed before he moved on to his next appointment.
Excellent explanation - Showing concern & very patient & allowed us time to ask our questions & answered them & made sure we understood them.
This is a biopsy procedure w/Dr. Sonn. Originally my dr. told me the procedure will take 12 samples (believe it is the standard). The dr. actually took 17 samples without telling me in before hands. It's okay given that the MRI had positive report, but appreciate be infor.
Dr. Sonn's care Friday EVENING was over the top - He could have waited until Monday to discuss test results - BUT he called Friday evening - plus or minus 7:00pm.
Dr. Sonn was extremely well prepared in advance for my appointment. he had a thorough understanding of my history making our time together very productive.
Dr. Sonn did an excellent job of walking me through the procedure.
This was my second biopsy. The first oe a number of years ago was less uncomfortable. I would have liked a bit of fore warning that the procedure would be significantly more uncomfortable
I have already referred Dr. Sonn to a friend.
it was very helpful to be able to view the procedure on the screen.
Dr. Sonn was very impressive as expected and I feel quite confident and comfortable with his care
Dr. Sonn spent considerable time with us. Upon leaving felt much better about our condition and it's treatment.
Dr. Sonn is top notch in all regards.
Very satisfy.
Excellent experience with Dr. Sonn and his team!
Doctor G. A. Sonn is highly skilled oncologist - urologist.
Dr. Sonn is always great.
Never felt rushed, good quality care.
Extremely professional and relaxed demeanor, continuing treatments and time line well described
Dr. Sonn is simply a 20 on a scale of 10. from our 1st meeting for biopsy in April 2016, through every turn, Dr. Sonn has been a God send! I don't believe there could have been a better Dr. Professional, compassionate, gave us confidence for a future!!
Dr. Sonn seemed very well educated about my situation and explained it very well to me and I left very happy.
Very helpful
Dr. Sonn outlined my options clearly. He is an excellent doctor.
very good explanation to bph and related symptoms , answered my questions . rhe best urologist i have ever seen
Visit primarily handled by assistant student, which was ok but not expected.
Dr. Sonn is excellent
Very impressed. One of the best experiences I have had with a dr.
Dr. Sonn provided medical information in a manner in which I was able to feel comfortable in dealing with my condition.
Great bedside manner : cut to the chase, felt like I was in good hands.
Good experience.
A junior colleague of Dr. Sonn (he may have been an intern or resident) met with me for about 20 minutes in advance of Dr. Sonn's arrival. I don't remember his name but he was very friendly, knowledgeable and patient.
Excellent service with doctor and PA. The NP doesn' t know how to smile, sorry to tell about this
Couldn't be better -
Intelligent, caring, compassionate, clear information, did not rush to move us along. Doctor Sonn has our highest degree of respect and gratitude. He is a gem.
Doctor sonn is very friendly person his knowledge about my case is excellent & the way he Handel my case is up to date method he answer all of my question Spend time with me to explain what I need to do until Next visit any time I can contact him if I have question I am very confident with him & I have felling that I am in good hand.
Dr. Sonn is excellent!
Very good.
Dr. Sonn is very communicative, explains clearly, easy to talk to, proficient and conveys both competency and confidence. A great doctor.
Dr. Sonn seems very capable. However, this biopsy (out of 3) was, by far, the most painful.
Dr. Sonn is one of the best doctors I have - intelligent, caring, clear, skilled.
We were very impressed.
Dr. Sonn was excellent.
I'm extremely happy with the service given, also very grateful.
Dr. Sonn is a brilliant doctor and surgeon. He explained clearly, I felt very confident in the best robotic biopsy by him.
I would recommend anyone who is in need for this care.
This was a referral for an MRI - guided prostate biopsy and Dr. Sonn is a highly trained specialist.
MDs should communicate and not be aloof. Dr. Sonn is impersonal.
Dr. Sonn was highly educated, informative kind & included me in the process - Love him.

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