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Benjamin Leach,

M.D.

Medical Oncologist and Hematologist

4.9 (213 Ratings)
Biography photo
Location
Mission Hills
15031 Rinaldi Street, Suite 150
Mission Hills, CA 91345
Specialties
Medical Oncology
Education
Medical school:
Board Certifications
  • 2019, American Board of Internal Medicine, Oncology

  • 2019, American Board of Internal Medicine, Hematology

  • 2014, American Board of Internal Medicine

Degrees
  • 2011, M.D., Tulane University, New Orleans, Louisiana

  • 2005, B.S., biological sciences, University of Illinois, Chicago, Illinois

Fellowship
  • 2014-2017, Hematology and Oncology, New York-Presbyterian Hospital, Weill Cornell Medical College, New York, New York

Residency
  • 2011-2014, Intern and Resident, Department of Medicine, Los Angeles County + USC Medical Center, Los Angeles, California

Professional Experience
  • 2017-present, Assistant Clinical Professor, Department of Medical Oncology & Therapeutics Research, City of Hope, Mission Hills, 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.
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."
May 20, 2025
5.0
"We did a telephone appt, no video and all went well"
Apr 29, 2025
5.0
"VERY WELL COORDINATED!"
Apr 29, 2025
5.0
"DR.BENJAMIN LEACH ALWAYS DISCUSSED TO ME IN DETAILS ALL OF MY HEALTH CONCERNS"
Apr 25, 2025
5.0
"Dr Leach is a very compassionate, understanding. Good listener and always takes his time to talk with me."
Apr 25, 2025
5.0
"I always recommend to others City of Hope."
Apr 14, 2025
5.0
"Dr. Leach has given my mother [...] the best possible care for the last 5 years. We are blessed to have him as her doctor."
Apr 6, 2025
5.0
"So far all good experience ."
Apr 6, 2025
5.0
"They are very efficient"
Apr 5, 2025
5.0
"I thank God for my great Doctors [...] and Dr Benjamin."
Feb 27, 2025
5.0
"Dr Leach is exceptional and he has an exceptional team because I believe he sets the tone of the office."
Feb 27, 2025
5.0
"Dr Leach is amazing. He is so bright and remembers details and special situations from past appointments and always and gentle and gracious in listening to the patient. I would wholeheartedly recommend him to family and friends."
Feb 26, 2025
5.0
"Dr. Leach is an excellent doctor and very caring for his patients."
Feb 20, 2025
5.0
"Good"
Feb 20, 2025
5.0
"Excellent"
Feb 20, 2025
5.0
"ALL WERE DEDICATED STAFF AND PROVIDED EXCELLINT PATIENTS SERVICES."
Feb 20, 2025
5.0
"SO FAR DR.LEACH IS ONE OF THE BEST AMONG DOCTOR I HAD VISITED. EXCELLENT AND VERY DEDICATED."
Feb 7, 2025
5.0
"I have already recommended several people to City of Hope and My Doctor"
Feb 7, 2025
5.0
"I really appreciate dr Leach he is a very knowledgeable, listening and caring person"
Jan 29, 2025
5.0
"Dr. Leach is excellent!"
Jan 27, 2025
5.0
"Seemed friendly and knowledgeable. Answered my questions and concerns."
Jan 24, 2025
5.0
"I feel I'm getting the very best advice and care. I definately would recommend City of Hope to my family, friends and neighbors."
Jan 24, 2025
5.0
"This was my first visit with Dr. Leach and I feel very reassured that my treatment is in very capable hands.I look forward to having him as my regular doctor at City of Hope"
Jan 23, 2025
4.9
"I would recommend Dr. Leach and [...] to anyone with an oncology concern."
Jan 9, 2025
5.0
"Very pleased with Dr Benjamin Leach ."
Dec 18, 2024
4.9
"Good"
Dec 18, 2024
4.9
"Good"
Dec 5, 2024
5.0
"Best experience with Dr Leach"
Nov 26, 2024
4.9
"EXCELLENT!"
Nov 26, 2024
4.9
"DR LEACH WAS A VISITING DOCTOR WHILE I WAS ADMITTED [...] AND WAS VERY FRIENDLY INFORMATIVE,AND CONCERNING TO WHAT HE UNDERSTOOD OF MY PRESENT MEDICAL ISSUES. EXCELLENT DOCTOR GIVING HIM A 101% RATING..."
Nov 22, 2024
5.0
"It is always a joy to see Dr. Leach."
Nov 22, 2024
5.0
"Doctor and nurse always been great. [...]"
Nov 15, 2024
4.9
"Very good."
Nov 15, 2024
4.9
"Good experience"
Nov 14, 2024
5.0
"Good"
Nov 2, 2024
5.0
"I love City of Hope! I have received great care and all staff, assistants and doctors are great!"
Oct 28, 2024
5.0
"Dr. Leach is an outstanding doctor that always thoroughly explains my test results, recommended treatment, etc. I highly recommend him to others with cancer."
Oct 16, 2024
5.0
"Dr Leach is so easy to talk to. He keeps things real. He does a great job explaning the diagnosis."
Oct 9, 2024
5.0
"I really like and appreciate Dr Leach"
Sep 29, 2024
5.0
"I definitely recommend my care provider. He is an awesome doctor and it's always checking on you and your health overall"
Sep 29, 2024
5.0
"Simply awesome"
Sep 29, 2024
5.0
"Great"
Sep 5, 2024
5.0
"Dr Leach is a very informative and compassionate doctor that I fell extremely comfortable with. He is kind and patient with all of my questions."
Aug 2, 2024
5.0
"Well done."
Aug 2, 2024
5.0
"Dr Leach is very attentive and treats me with value. Takes his time listening and answering questions."
Jul 26, 2024
5.0
"Dr. Leach is always very friendly and is excellent at informing me of/explaining test results and proposed treatment."
Jul 26, 2024
5.0
"I highly recommend COH, Dr. Leach and the staff. Great care providers!"
Jul 22, 2024
5.0
"I had questions about a medication I was prescribed by my primary Dr. He answered them."
Jul 22, 2024
5.0
"Always the best with Dr Leach"
Jul 21, 2024
5.0
"My doctor is very friendly"