3927 Waring Rd. Suite C, Oceanside, CA 92056
Appointments: (760) 941-9850

Providing Endocrinology Services in North County Since 1983

Our Doctors

Chris K. Guerin, MD, FACE, FNLA

Chris K. Guerin, MD, FACE, FNLA

Dr. Guerin was born and raised in Chicago, Illinois.  He completed his medical education at Loyola University School of Medicine in Maywood, Illinois and internship and residency in Internal Medicine at the world-renowned Mayo Clinic in Rochester, Minnesota.  

Dr. Guerin completed his subspecialty training in Endocrinology, Diabetes, and Metabolism at the Mayo Clinic before moving to  San Diego.  He continued his research interests while in San Diego by completing a Post-Doctoral Scholarship sponsored by the National Institutes of Health (NIH) at UCSD.  Dr. Guerin is board certified in Endocrinology and Metabolism, Internal Medicine, and Lipidology.  

Dr. Guerin has been serving the North County since 1983.  He previously served as Chief of the Division of Internal Medicine and Chair of the Department of Medicine at Tri-City Medical Center (TCMC).  Currently, Dr. Guerin serves as Medical Director for Diabetes Education Services and the Diabetes Service Line at TCMC.  He continues to be actively involved in patient and physician education and clinical research. Dr. Guerin is a Charter Member of the Fellows of the American Association of Clinical Endocrinologists and the Endocrine Society.  He is also a member of the Professional Section of the American Diabetes Association, the National Lipid Association, the San Diego County Medical Association, and the Mayo Alumni association.  His dedication to diabetes has been recognized with an American Diabetes Association’s Provider Recognition Award, with distinction. 

Dr. Guerin is married with two children.  He enjoys outdoor activities with his family including camping and windsurfing.  He has a strong family history of diabetes and heart disease.  In fact, his father died of complications from diabetes at age 51; his grandfather died at a young age and also had diabetes.  In his practice, he encourages his patients to incorporate good dietary choices and increased exercise for improved health. 

Alan B. Douglass, MD, FACE, FACP

Alan B. Douglass, MD, FACE, FACP

A native of California, Dr. Douglass earned his medical degree in 1991 from the University of Southern California School of Medicine. After graduating from medical school, Dr. Douglass was commissioned as an officer in the United States Navy.  He completed his internship and residency in Internal Medicine at Naval Medical Center San Diego, and later completed subspecialty fellowship training in Endocrinology  Diabetes and Metabolism at National Naval Medical Center in Bethesda, Maryland. He returned to Naval Medical Center San Diego in 2001, and served as attending staff, teaching residents, interns and medical students. He retired from the U.S. Navy in 2013 with the rank of Captain after serving over 22 years.

Dr. Douglass previously served as Head of the Internal Medicine Division and Head of the Endocrinology Division at Naval Medical Center San Diego. He was Chair of the Navy Bureau of Medicine and Surgery's Diabetes Working Group, working to improve the care of diabetes in Navy medicine worldwide. He was a member of the expert panel that developed the current Veterans Affairs/Department of Defense Clinical Practice Guideline for the care of diabetes mellitus. 

Dr. Douglass is a Fellow of the American College of Endocrinology and a Fellow of the American College of Physicians. He is also a member of the Endocrine Society. Dr. Douglass is board certified in Endocrinology, Diabetes and Metabolism and in Internal Medicine. He has interests in all fields of Endocrinology, in particular thyroid disease, diabetes, and pituitary disease. He strives to help all of his patients be active participants in their treatment, ensuring they understand their treatment options and assisting them in making good health care and lifestyle decisions. 

Dr. Douglass is married and has two sons. He enjoys spending time with his family, relaxing in beautiful sunny San Diego, and watching the Padres and Chargers win. 

Margot Aiken, MD

Margot Aiken, MD, FRCPc, ABIHM, FACE


Endocrinology, Diabetes & Metabolism

Areas of Expertise

  • Endocrinology, Diabetes & Metabolism
  • Internal Medicine
  • Reproductive Endocrinology & Infertility


Dr. Aiken specializes in internal medicine, fertility and reproductive endocrinology and diabetes and metabolism.

Board Certifications

  • American Board of Internal Medicine, Endocrinology, Diabetes & Metabolism, 1987
  • American Board of Internal Medicine, Internal Medicine, 1983

Medical Education 

University of Calgary, MD, 1979


  • University of Calgary Health Science Center, Internal Medicine, 1982
  • University of Toronto, Internal Medicine, 1981


Foothills Hospital, Endocrinology, Diabetes & Metabolism, 1984