Meet Our Highly Experienced Veterinarians
We are proud to offer the highest quality animal care in Orange County! You can trust your loved one in our hands!


Dr. Jeff Margolis

jeff margolis veterinarian

Dr. Jeff Margolis holds a Master's Degree from Boston University, a DVM from Tufts University, and has been practicing in CA since 1996.

His interests lie in endocrinology, dermatology and general surgery. Jeff is the owner of OAH, a proud member of the AVMA, CVMA and SCVMA and works with the Mission Viejo Animal Shelter, Grayhound Pets of America and DAWG.

He is a lover of all sports (including avid stand-up paddlesurfer) and of music, and gets out as often as he can to participate in both. He currently lives with his wife Jody, daughter Zoe, son Jake and pets, Shea, Beckett, Ebbet and Fergie.

Jeff recently adopted a new golden retriever puppy to join the family, and makes it his personal goal to ensure all of his patients feel like their pets are part of the family as well. Jeff greatly values all of his clients/patients, and appreciates all of the years of service and opportunities to be a part of your pet's lives. With over 15 years of service to the Orange County Area, he is excited for every new patient!



Dr. Andrea Thormahlen

veterinarian andrea thormahlen

Andrea Thormahlen earned a Bachelors of Science from UC Davis and her Veterinary degree (D.V.M.) from Purdue University.  She is a native to Mission Viejo, and is thrilled to be back here doing what she loves.

Andrea has a special interest in dermatology, dentistry and endocrinology.  She is a member of SCVMA and CVMA. She is also a credentialed provider of stem cell therapy with Vet-Stem. Stem cell therapy is an innovative way to treat chronic joint diseases, injuries and has a multitude of therapeutic possibilities.

Andrea and her husband, Hays, have a family of 5, with 2 labrador retrievers, K.C. and Doc, and an orange tabby named Duddly. Andrea loves kick-boxing, pilates, reading and cooking for friends and family. Andrea and Hays are often on the trails in Trabuco Canyon with K.C. and Doc.

Andrea has a gentle heart and looks forward to working with your treasured four-legged family members as well as getting to know the whole family.



Dr. Lindsay Chandler

veterinarian andrea thormahlen

Dr. Lindsay Chandler is a native to Orange County and is excited to be back here in South County practicing Veterinary Medicine since earning her Doctorate of Veterinary Medicine Degree from the University of California, Davis, in 2011.

Lindsay finds great fulfillment professionally as she develops and maintains long term, caring relationships with both her patients and their owners. She also takes pride in keeping current through attending seminars throughout the year on the latest theories and techniques in this fascinating and constantly changing field. Her professional interests are in Internal Medicine, Soft Tissue Surgery, Dental Care and Pain Management where she can provide her patients with excellent care. Lindsay knows it is important to take time to thoroughly discuss all available options and will always individually tailor the care for you and your pet.  

Lindsay is a member of the Southern California Veterinary Medical Association, the California Veterinary Medical Association, as well as the American Veterinary Medical Association. She enjoys associating with other Veterinarians and Veterinary Specialists and networking throughout the veterinary community.

Lindsay and her husband James share their lives with a menagerie of pets including 2 long haired miniature Dachshunds, an Australian Shepherd, a rescue Pitt Bull mix, 3 cats, and a Quarter Horse named Prince. Lindsay looks forward to getting to know you and working with your beloved fur kids!

Meet The Rest Of Our Office Staff >>

Animal Hospital

Olympiad Animal Hospital
23032-A Alicia parkway
Mission Viejo, CA 92692

Call us today to schedule an appointment for your pet. Our staff is always available for you and your pet!

Clinic Location

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