Geoffrey Sonn

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

Assistant Professor of Urology and, by courtesy, of Radiology

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Geoffrey Sonn, MD is a board certified urologist who specializes in treating patients with prostate, kidney, and testicular 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 is the principal investigator of the first clinical trial in Northern California to use MRI-guided focused ultrasound to treat prostate cancer. The goal of this trial is 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 as an assistant professor in urology 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.

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

Urology Clinic Palo Alto, CA
Palo Alto, CA

1000 Welch Road, Garden Level

Palo Alto , CA 94304

(650) 723-3391

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

2589 Samaritan Drive

San Jose , CA 95124

(833) 444-7622

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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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Patient Ratings

(162 Ratings)

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Patient Reviews

(93 reviews)

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.
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.
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. John & his staff are the best!!
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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