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Benjamin Leach,

M.D.

Medical Oncologist and Hematologist

4.9 (191 Ratings)
Biography photo
Location
City of Hope Mission Hills
15031 Rinaldi Street, Suite 150
Mission Hills, CA 91345
Specialties
Medical Oncology
Education
Medical school:

M.D., Tulane University, New Orleans, LA

Residency:

Department of Medicine, Los Angeles County + USC Medical Center, Los Angeles, CA

Academic Appointments
  • Assistant Clinical Professor, Department of Medical Oncology & Therapeutics Research
About Me

"My own approach to patient care is mirrored by the culture at City of Hope — where compassion, innovation and collaboration are at the heart of everything we do.” 

At City of Hope® Mission Hills, medical oncologist Benjamin Leach, M.D., uses the latest advances in cancer care — from precision medicine to immunotherapy — to improve the lives of his patients. He takes a personalized approach and believes strongly in building trust and understanding each person’s journey. “It’s a privilege to be welcomed into a patient’s life,” he says. 

Dr. Leach earned his medical degree from Tulane University in New Orleans, followed by an internship and residency at Los Angeles County + USC Medical Center. He completed his hematology/oncology fellowship at New York-Presbyterian Hospital/Weill Cornell Medical College, where he was honored with the Weill Department of Medicine Fellows Award in Research for his work on targeted treatments in colorectal cancer.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Mar 28, 2026
5.0
"Both doctors I've seen there ([...] and Dr. Leach) were kind, compassionate, and listened to all of my health concerns and answered every question I had. They treated me with respect and talked TO me rather than AT me. (I saw them in separate appointments, NOT together)"
Mar 17, 2026
5.0
"I am very happy with the recommendations that doctor gives me."
Mar 16, 2026
5.0
"Dr. Leach is an excellent oncologist and he has provided me with tremendous care. I owe my continued good health to him! There's no one better!"
Mar 10, 2026
5.0
"With Dr. Benjamin Leach for 7 years, my experiences have always been very good."
Mar 10, 2026
5.0
"I would recommend City of Hope because I have always been taken care of, treated, and cured very well."
Mar 7, 2026
5.0
"Excellent facility and staff."
Mar 7, 2026
5.0
"Dr Leach is an excellent physician. He takes very good of me as a patient."
Feb 17, 2026
5.0
"Dr Leach is so caring and kind and respectful and considerate and just all around wonderful, in addition to being an excellent doctor. He explains everything in an easy to understand way."
Feb 11, 2026
5.0
"Definitely I recommend City of Hope to friends"
Feb 11, 2026
5.0
"I respect Dr Leach he is an asset to City of Hope"
Feb 5, 2026
5.0
"Excellent"
Feb 5, 2026
5.0
"Excellent from start to finish"
Jan 17, 2026
5.0
"Great Doctor!!!"
Jan 17, 2026
5.0
"All very good"
Jan 17, 2026
5.0
"All very well"
Jan 9, 2026
5.0
"Dr. Leach is a rock star."
Jan 7, 2026
5.0
"Dr. Leach was the best."
Jan 1, 2026
5.0
"Dr Leach is a very knowledgeable and caring person, and I wouldn't see any other doctor."
Jan 1, 2026
5.0
"I would recommend City of Hope because of Dr Leach and the staff at your Mission Hills office. I know them as City of Hope and I respect and appreciate every one of them."
Dec 18, 2025
5.0
"I already did refer a friend. [...]"
Nov 25, 2025
5.0
"The best doctor I have encountered in my life. Was really empathetic, explained in detail and patient to explain and answer all questions."
Nov 18, 2025
5.0
"Dr Leach is excellent!"
Nov 18, 2025
5.0
"They are a great TEAM!"
Nov 12, 2025
5.0
"So far Dr. Leach is a 10/10! He's confident, knows my case, listens to me respectfully, communicates in ways I can understand, and is compassionate. He's awesome."
Oct 29, 2025
5.0
"I wish Dr Leach could be cloned. He is exceptional. City of Hope should be proud that they have such a representative."
Oct 22, 2025
5.0
"Excellent team work!!!!"
Oct 22, 2025
5.0
"I always recommend this City of Hope place is nice and is like second home!! I feel secure here!!! Mission Hills the Best"
Oct 12, 2025
5.0
"I really like Dr. Leach. [...]"
Oct 9, 2025
5.0
"Proud of City Hope!"
Sep 22, 2025
5.0
"All good"
Sep 16, 2025
5.0
"All very well"
Sep 16, 2025
5.0
"I am very happy with the staff. Doctor and his assistants."
Sep 11, 2025
5.0
"All good with this group"
Aug 19, 2025
5.0
"Excellent doctor!!!"
Aug 15, 2025
5.0
"Dr. Leach is awesome."
Jul 30, 2025
5.0
"Dr. Leach is very knowledgeable and helpful with my treatment. A excellent physician. His medical staff are very attentive, caring and helpful."
Jul 20, 2025
5.0
"Excellent doctor. Happy to have him"
Jul 14, 2025
5.0
"VERY GOOD EXPERIENCE!"
Jul 14, 2025
5.0
"VERY GOOD ECPERIENCE!"
Jul 11, 2025
4.7
"Dr Leach seems that he cares for his patience and try to do the best for them"
Jul 2, 2025
4.7
"Any questions I had Dr. Leach answered. He truly listened to any concerns I had and made me feel at ease."
Jun 25, 2025
5.0
"So far is been all good !!"
Jun 25, 2025
5.0
"We got a really good group !!"
Jun 22, 2025
5.0
"Dr Leach is absolutely the best oncologist."
Jun 11, 2025
5.0
"Always excellent care"
Jun 7, 2025
5.0
"Dr Leach always has a positive, caring attitude. He always is patient and I never feel rushed"
Jun 7, 2025
5.0
"Dr Leach is very supportive, kind, informative , he never rushed the visits he always took the time to listen. He genuinely cares about his patients"
May 29, 2025
2.1
"Bad experience"
May 28, 2025
5.0
"Dr. Leach was very knowledgeable and provided me with extensive information about the type of cancer that I had. He was excellent about explaining the reason for my chemotherapy and expectations."