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Surgery Group LA
World-Renowned Surgical Specialist Based at Cedars-Sinai Hospital
If you are reading this, you or a loved one are likely concerned about a medical issue that might require surgery. Many patients who come to us have either been recently diagnosed or are coping with a chronic medical condition that they want to have examined by a top-notch surgeon to ensure they get the best advice and treatment. Our team of surgeons are all board-certified general surgeons, who all specialize in a specific area of surgery. However, despite our team’s surgical skills and experience, our goal is avoid performing surgery whenever possible. Should surgery be necessary, each of our surgeons utilizes their advanced skills and state-of-the-art technology to perform minimally invasive surgery. As trusted experts, our surgeons are often called upon to perform emergency surgery on patients admitted to Cedars-Sinai Hospital, as well as other leading hospitals in LA. Each one of our surgeons are also highly regarded as educators and leaders in their respective fields. Most importantly, their skills and experience are equally matched by their compassion and listening skills – which we believe are as important as their surgical skills.
Experience matters. Our surgeons have achieved the highest standard of recognition for their expertise and skill.
More importantly, our team of world-renowned surgeons have saved countless lives, and have enabled countless more to live healthy, happy lives.
What Our Patients Say
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My experience with Dr. Jason S. Cohen has truly been a blessing.
He was very kind, understanding and most importantly very professional. He has given me a chance to be a healthy woman once again, he is an artist in my eyes and I thank him for being amazing at what he does. The surgery went better than expected and recovery is much more pleasant than I expected. -
I wouldn't feel safer with any other surgeon except Dr. Barnajian
Dr. Barnajian always answers any and all questions I've had and never gives the feeling of rushing me out the door for his next appointment. For my particular health issue, I wouldn't feel safer with any other surgeon except Dr. Barnajian. Also, his staff is efficient and friendly and also helps with any issues. -
Dr. Nasseri is a surgeon extraordinaire and a genuine human being!
He performed a Pilonidal Cystectomy on me and did a fantastic job. This was my second surgery, the first one being unsuccessful and performed poorly by another physician. I just wished I came to Dr. Nasseri first. -
Dr. Elizabeth Arena is gracious, compassionate, and patient.
She is a gifted, brilliant surgeon, and a remarkable human being. Albeit, I opted not to undergo a lumpectomy, Dr. Arena allowed me to take my time to make the best decision. Hence, during my consultation, Dr. Arena made me feel comfortable and answered all of my questions. -
Dr. Ellenhorn puts patients first and I highly recommend him!
I was nervous to meet with Dr. Ellenhorn and prepared myself for surgery to deal with my medical issue. To my great relief, Dr. Ellenhorn advised against surgery in my case. He took a conservative approach, using non-surgical methods to thoroughly deal with my medical issue and took great care of me. -
The hands down, BEST medical care I've received in my life.
Not even sure where to begin on the EXCELLENT service, hospitality, and care this office maintains. Much to his credit, Dr. Leo Gordon oversaw an inguinal hernia I had and helped me monitor it for nearly 2 years. The hospitality and personal care was truly second to none. -
I cannot say enough great things about Dr. Ellenhorn.
The staff at the surgery group of Los Angeles are wonderful. They are kind, very attentive, the office is clean and I did not have to wait long at all. I cannot say enough great things about Dr. Ellenhorn. He is an excellent surgeon who is highly skilled and very knowledgeable. I cannot thank him enough. -
There was no nerve damage. And, NO VISIBLE SCAR.
Dr. Cohen told me about possible risk of nerve damage. I was a bit nervous about surgery on my face, but felt in good hands. It's been 4 months and I am very pleased with the outcome. There was no nerve damage. And, NO VISIBLE SCAR. I would highly recommend Dr. Jason Cohen for surgery. He's a 5 star guy. -
First, let me start by saying that Dr. Nasseri is an amazing doctor!
Dr. Nasseri is an amazing doctor! I don't usually give reviews but he truly deserves it. The office is super clean, and the staff is really nice. I was in a lot of pain from my pilonidal cyst and needed to have it drained as soon as possible. He understood my situation and made room for me the same morning. Thank you!
Meet Our Surgeons
To schedule an evaluation with one of our highly respected specialized surgeons, please dial 424 303 4949, where your call will be answered – without having to endure voice prompts – by one of our caring and knowledgeable team members.
Jason Cohen MD, FACS
Surgical Oncologist, Surgery Group LA
Dr. Jason Cohen is a surgical oncologist and general surgeon with expertise in laparoscopy and minimally invasive techniques. His main focus of practice is in head and neck endocrine surgery, specifically management of diseases of the thyroid and parathyroid glands. He is at the forefront of thyroid cancer treatment and prevention and treats both benign and malignant tumors of the breast and gastrointestinal tract as well.
Yosef Nasseri MD, FACS, FASCRS
Colorectal Surgeon, Robotic Surgery Specialist
Dr. Yosef Nasseri is one of the founding partners of Surgery Group LA. He is double board-certified in general and colorectal surgery, and is considered one of the most prolific robotic colorectal surgeons in the United States. Dr. Nasseri specializes in robotic and minimally invasive techniques for the treatment of colon and rectal diseases; such as cancer, inflammatory bowel disease, and Crohn’s. Dr. Nasseri is very active in clinical research, and academia and he frequently collaborates with surgeons and physicians from diverse specialties. His research is primarily outcomes based, with a concentration in both benign and malignant colorectal diseases, which allows him to introduce and test new treatment modalities and algorithms. As a thought leader, Dr. Nasseri has published several book chapters, journal articles, and presented at various conferences.
Joshua Ellenhorn, MD, FACS
General Surgeon, Surgical Oncologist
Dr. Joshua Ellenhorn is a partner at Surgery Group LA and an accomplished board-certified surgeon with a clinical focus on innovative treatments for benign and malignant surgical conditions including hernias and gallbladder conditions in addition to… breast cancer, gastrointestinal metastases and other types of cancer. He is an accomplished educator, and has been repeatedly…
Moshe Barnajian, MD, FACS
Colorectal Surgeon, Robotic Surgery Specialist
Dr. Moshe Barnajian is a board-certified colorectal and general surgeon specializing in minimally invasive and advanced surgical techniques. His specialized training has provided him with the advanced expertise in all aspects of colon, rectal, and anal surgery from laparoscopic and robotic colon resection for colorectal cancer and inflammatory bowel disease, to complex anorectal disease including hemorrhoids, fissures, fistula, and HIV related anorectal disorders. Dr. Barnajian has lectured at both national and international meetings and has published multiple peer-reviewed articles in prestigious journals including Colorectal Disease. Dr. Barnajian is also a medical peer reviewer for multiple prestigious colorectal journals, including Colorectal Disease and Techniques in Coloproctology.
Elizabeth Arena, MD
Breast Surgery Specialist
Dr. Elizabeth Arena is a double board-certified surgical oncologist and general surgeon, specializing in caring for patients with benign or malignant diseases of the breast. As one of the first ever American Board Certified Surgical Oncologists, Dr. Arena has specific expertise that makes her one of the most esteemed breast surgeons in the greater Los Angeles area.
Leo A. Gordon, MD, FACS
Senior Consultant in Clinical Surgery
Dr. Leo A. Gordon, MD, FACS, is the senior consultant in clinical surgery at Surgery Group LA. He has extensive experience in breast and gastrointestinal surgery for both benign and malignant cancers, as well as expertise in laparoscopic surgical procedures. He is also one of the country’s leading resident educators.
Steve Colquhoun MD, FACS
Dr. Colquhoun is a liver, bile duct and pancreas surgeon, transplant surgeon and surgical oncologist with board certification in both general and critical care surgery. He completed fellowships in both surgical oncology and multi-organ transplant surgery at UCLA. He does both open and robotic minimally invasive surgery. Dr. Colquhoun takes pride in providing excellent and compassionate patient care with 24/7 availability
