Our Team

Dr. Schultzel, Dr. Burgess, and the rest of the team specializes is minimally invasive colorectal surgery in San Diego. See information regarding our fellowship and surgeons below.


Minimally Invasive Colon and Rectal Surgery through the UTMB and Houston Methodist Hospital

  • Special emphasis on the minimally invasive approach to Colon and Rectal Surgery
  • Advanced Robotics Training
  • Single Incision Laparoscopic Training
  • Transverse Abdominus Plane Block (TAP Block)
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Dr. Schultzel spent an extra year after his General Surgery Residency for training in advanced Colon and Rectal Surgery. During his time in Houston he performed hundreds of Colorectal procedures and is one of most experienced surgeons in the US in the Single Incision approach to laparoscopic surgery (SILS). He is one of the only surgeons in Southern California routinely performing SILS surgery and one of the few performing TAMIS and TATME procedures.

We are also proud to offer an in-house internship program to premedical, pre-PA, and pre-health. Learn more about interning with us here.

Dr. Schultzel

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My mission is to provide top level surgical care to all my patients. I employ the newest technology and have undergone a great deal of training in order to bring the most advanced treatment modalities to my patients. It is my pleasure to treat you.

Warm Regards,

Matthew Schultzel, DO

About Dr. Schultzel

Dr. Schultzel is a California native, born in Walnut Creek, California. He attended the University of California San Diego for his undergraduate studies. His medical education then took him to San Francisco, San Diego, Los Angeles, New York, New Jersey, Houston, and finally back to San Diego. Dr. Schultzel is the Divison Chief for General, Robotic, and Colorectal surgery at United Medical Doctors. Read more about Dr. Schultzel in this article from the Sharp Health News Team.

Citizenship: USA

College: University of California, San Diego, B.S. Biology/B.A. Psychology

Medical Education: Touro College of Osteopathic Medicine-California, Doctor of Osteopathic Medicine

Residency: UC San Diego – General Surgery, Hackensack- Palisades Medical Center – General Surgery.

Fellowship: Minimal Invasive Colon and Rectal Surgery, Laparoscopy/Endoscopy, UT Health System, Houston Methodist Hospital, Herman Memorial Hospital

Honors and Awards

Eagle Scout Award

National Youth Leadership Forum on Medicine

Phi Delta Epsilon International Medical Fraternity

  • Chapter Founder’s Award
  • Outstanding Member Award*

Stein Institute for Research on Aging (SIRA)

  • Medical Student Training on Aging Research
  • (MSTAR) Grant

Administrative Chief Resident

American College of Osteopathic Surgery Resident Council President

Closing Bell New York Stock Exchange

UCSD “40 Under 40” alumni award

San Diego Magazine Top Doctor 2018, 2019, 2020, 2021, 2022, 2023

American Cancer Society Top Surgical Oncologist in San Diego 2019

Society Memberships

American Medical Association

American College of Surgeons

American College of Osteopathic Surgeons

Society of American Gastrointestinal Endoscopic Surgerons

American College of Colon and Rectal Surgeons

American Osteopathic Association


Schultzel M., Schultzel M., Wentz B., Bernhardt, M.
The Prevalence of Injury in Kendo.
The Physician and Sportsmedicine 11(1): 1-5, Nov 2015.

Schultzel M, Kalsi R, Goldman F.
Malignant Fungating Phyllodes Tumor.
Journal of Cancer Treatment Communications, Volume 2, Issue 2, 30-33.

Schultzel M, Arnold T, Fornari M, Miglietta M.
Megacolon Secondary to Chronic Constipation.
World J Med Surg Case Rep 2013;2:45-49.

Sanders CM, Saltstein SL, Schultzel MM, Nguyen DH, Stafford HS, Sadler GR.
Understanding the Limit of Large Data Sets.
J Cancer Educ. 2012 Dec;27(4):664-9.

Schultzel M, Saltstein SL, Downs TM, Shimasaki S, Sanders CM, Sadler GR.
Late Age (>85 Years) Peak Incidence of Urinary Bladder Cancer.
Journal of Urology, 2008. 179 (4): 1302-6.

Downs TM, Schultzel M, Shi H, Sander C, Tahir Z, Sadler GR.
Renal Cell Carcinoma: Risk Assessment For Newly Diagnosed Patients.
Critical Reviews in Oncology/Hematology, 2009, Apr. 70(1): 59-70.

Schultzel, M.
Excelling Under Pressure: DO’s Share their Insights, Strategies
DO Magazine, 2013.

Schultzel M, Nguyen DH.
Straight from the Laboratory: a Kidney cancer study done exclusive on Asians.
Filipino Press, July 27-August 3rd 2007.


Pain and Poops: Then and Now – The Bloomin’ Uterus Blog


Fecal Incontinence: Evaluation and Management. Palisades Medical Center Grand Rounds, North Bergen, NJ. September 2015 Fecalization of Small Bowel as indicator towards conservative therapy rather than surgery: A single center Large Retrospective Study.
American College of Osteopathic Surgery Symposium: Boston, MA, 2014.
Megacolon Secondary to Chronic Constipation. American College of Osteopathic Surgery Symposium: Las Vegas, NV, 2013.

Special Activities

Ethicon Young Surgeons Course, Houston Methodist Hospital, October 2015: Presenting Surgeon
Amtrak Police Surgeon, NYC/NJ, 2013-present UN Global Security Councel/US Secret service Volunteer Surgeon 2013-2014
Touro College of Osteopathic Medicine, New York – Adjunct Clinical Instructor of Surgery: 2012-2015
New York Mets Team Physician 2012

Surgical Experience

Completed Da Vinci Robotic Console Training, 2015

Completed Da Vinci Robotic Console First Assist Training, 2012

Advanced Laparoscopic including mastery of the SILS (single incision laparoscopic)

Advanced endoscopy and colonscopy

Course Instructorship

SILS Colorectal Course Instructor: USA

TAP Block Course Instructor: USA

Hobbies/ Interests


Kendo (5 dan)




Dr. Daniel Burgess, DO

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Dr. Burgess, originally from Greeley, Colorado, joins us after a five year stay completing his medical residency at CarePoint Health system in New Jersey. After working as a lab technician at Creighton University in Omaha, Nebraska, he earned his medical degree at the Kansas City University of Medicine and Biosciences. In step with our medical philosophy, Dr. Burgess also specializes in minimally invasive robotic surgery.

In addition to being an avid reader and world traveler, Dr. Burgess is also interested in swimming. In fact, he was on the Rider University swimming team as an undergraduate student.

Kassandra Neuendorff, PA

Kassandra is a San Diego native and received her Bachelor’s Degree in Clinical Nutrition from the University of California – Davis in 2015. Following graduation from UC Davis, she completed her dietetic internship in New York City. She practiced as a Clinical Registered Dietitian for 4 years before deciding to pursue her career as a Physician Assistant. She graduated from South University – Richmond in 2023 and returned home to start her PA career. Kassandra loves spending time outdoors, reading, and participating in fun events around San Diego. Kassandra is certified through the National Certifying Commission of PAs and the state of California.

Professional Education

South University – Richmond Physician Assistant Program

Board Certifications

National Certifying Commission of Physician Assistants, PA-C

Commission on Dietetic Registration, RD

Harper Smith, PA

Harper was born and raised in sunny Scottsdale, Arizona. In 2019, she completed her Bachelor of Science degree in Physiology from the University of Arizona. Harper continued her education in Savannah, Georgia at South University, where she received her Master of Physician Assistant Studies in 2023. Harper is certified through the National Commission on Certification of Physician Assistants and the state of California. Along with her dedication to her profession, she believes in making every moment count and creating unforgettable memories. She’s passionate about all things food, travel, and loves embracing her new found beach life.

Holly Contreras, MPAP, PA-C

Holly grew up in Fallbrook, CA and received her Bachelor’s degree in Human Biology from the University of Southern California in 2016. As an undergrad, she volunteered her time teaching science lessons and coaching tennis at local elementary schools. After graduating, she worked as a Cardiovascular Technician at West Hills Hospital for several years before pursuing her Physician Assistant degree. She went on to graduate from the USC Keck School of Medicine PA Program in 2023, after which she relocated home to San Diego and joined our team. She is board certified through the National Commission on Certification of Physician Assistants (NCCPA) and licensed by the Physician Assistant Board of California. Holly loves traveling abroad, camping with her dog, rock climbing, and surfing.