Our Providers
Ruby Lo, MD, MPH
Undergraduate School
U.C. Berkeley 
Graduate School
Case Western Reserve U. 
Medical School
Case Western Reserve U. 
Graduate School
Harvard University 
Residency
Beth Israel Deaconess 
Vascular Surgery Fellowship
Beth Israel Deaconess |
Dr. Lo is a San Jose native and returns closer to her hometown after four years in a robust academic practice. Her prodigious educational background started at UC Berkeley as an undergraduate. She then continued her extensive schooling, becoming the recipient of two Master's degrees, one in Applied Anatomy from Case Western Reserve University and another in Clinical Effectiveness at Harvard's School of Public Health. During this time, she was also an esteemed Harvard-Longwood Research Fellow in the vascular surgery laboratory of Dr. Marc Schermerhorn. Her general surgery residency and vascular surgery fellowship were both completed at Beth Israel Deaconess, a world class teaching hospital of Harvard Medical School in Boston.
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Brian J. Waddle, MD, FACS
Undergraduate School
Pomona College 
Medical School
University of Arizona 
Internship
U.C. Davis 
Residency
University of California, East Bay |
Dr. Waddle completed his undergraduate training at Pomona College and entered the University of Arizona College of Health Professions as a merit scholar, graduating with honors. He worked for the US Indian Health Services as a Clinical Laboratory Scientist and graduated from the University of Arizona College of Medicine. He completed his surgical internship at the University of California, Davis and his surgical residency at the University of California, San Francisco. Dr. Waddle has broad surgical experience and specializes in minimally invasive surgery including advanced laparoscopy, thoracoscopy, endoscopy and DaVinci robotic surgery. He has practiced in Santa Cruz since 2002.
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Louis C. Lee, MD, FACS
Undergraduate School
U.C. Berkeley 
Graduate School
U.C.L.A. 
Medical School
George Washington University 
Residency
Inova Fairfax Hospital 
Endocrine Surgery Fellowship
Mayo Clinic, Rochester |
Dr. Lee is a California native who received his undergraduate degree from UC Berkeley, followed by a master’s degree in molecular biology, ecology and evolution from UCLA. After medical school and residency, he completed a fellowship in Endocrine Surgery at the prestigious Mayo Clinic in Rochester, MN. Dr. Lee is the only fellowship-trained expert in the entire Monterey Bay for diseases of the thyroid, parathyroid, and adrenal glands, as well as endocrine tumors of the pancreas and the gastrointestinal tract. He is active in national organizations including the American College of Surgeons and the American Association of Endocrine Surgeons. He is also skilled in DaVinci robotic single-site surgery as well as other advanced minimally invasive techniques. Dr. Lee has practiced in Santa Cruz since 2012.
If you are looking for an experienced thyroid, parathyroid, or adrenal surgeon, please select one endorsed by the American Association of Endocrine Surgeons: https://search.endocrinesurgery.org/Membership/Find-a-Surgeon |
Jessica Santillano, MD, FACS
Undergraduate School
Penn State University 
Graduate School
Harvard University 
Medical School
Temple University 
Residency
Temple University |
Dr. Santillano completed her undergraduate training at Penn State University and pre-medical studies at Harvard University. She entered Temple University School of Medicine after serving in the US Peace Corps, where she volunteered as a Health Educator in Ecuador, South America. She completed her surgical internship and residency at Temple University Hospital in her hometown of Philadelphia, PA. Dr. Santillano has broad surgical experience and specializes in minimally invasive surgery including advanced laparoscopy and DaVinci robotic surgery. She is an expert in diseases of the breast, performing surgery for both benign and cancerous lesions. Dr. Santillano is fluent in Spanish, se habla español. She joined the Surgical Associates of Monterey Bay in 2014.
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Paul Nguyen, DO, FACS
Undergraduate School
U.C. San Diego 
Medical School
Des Moines University 
Residency
Saint John Macomb Hospital |
Dr. Nguyen is a Bay Area native who completed his undergraduate degree in Human Biology at the University of California, San Diego. He went on to receive his medical degree from Des Moines University in Iowa. He then completed his surgical internship and residency in Detroit, MI. Dr. Nguyen has interests in multiple areas of general surgery, including minimally invasive surgery, hernias, gallbladder, colon, breast, bariatric weight loss surgery and endoscopy. He joined the Surgical Associates of Monterey Bay in 2016.
Dr. Nguyen performed the first weight-loss surgery in Santa Cruz. |
Zack Lamm, PA-C
Undergraduate School
CSU Chico 
Graduate School
Midwestern University |
Zack Lamm, PA-C, is a Bay area native who attended California State University, Chico and earned a Bachelor's of Science in Exercise Physiology. After graduating, Zack worked three years as an EMT in San Mateo and Santa Clara Counties. In 2019, Zack was accepted to Midwestern University in Glendale, AZ and earned his Masters of Medical Science in Physician Assistant Studies. Zack completed his clinical rotations in Arizona before returning to the Bay Area.
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Cristina Castellanos, PA-C
Undergraduate School
University of Puerto Rico, Rio Piedra 
Graduate School
Charles R. Drew University of Medicine and Science |
Cristina Castellanos Jiménez, PA-C, is a Puerto Rico native who attended University of Puerto Rico, Rio Piedra and earned a Bachelor's degree in Art History. After graduating, Cristina dedicated herself to the art industry and her family, until she discovered her passion for medicine. Cristina attended Cabrillo College to complete an associate degree in science and medical assistant certificate. She worked three years as a Medical Assistant lead in Santa Cruz County. In 2021, Cristina graduated from Charles R. Drew University in Los Angeles, CA, earning her Masters of Health Sciences in Physician Assistant Studies. Cristina worked as a Physician assistant in family practice in Santa Cruz and Watsonville before joining the SAMB team.
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