Meet Our Team

Dr. Randall Aten

DVM, Owner

Dr. Randall Aten is the owner of Corona del Mar Animal Hospital since 1992 and has been practicing in the Newport Beach area since 1987. Dr. Aten was born and raised in a small town in central Illinois. He originally thought of staying down on the farm, but as his education progressed he decided the challenges of small animal medicine were more rewarding. Dr. Aten graduated from Wabash College in Indiana with a B.A. in Biology and received his D.V.M. degree in 1982 from the University of Illinois.

In search of more mild winters, he landed in Las Vegas and gained a solid base of experience dealing with a variety of patients in the 24/7 environment of Las Vegas. In 1992 he made his final move in purchasing Corona del Mar Animal Hospital. It has been a daily joy living and working with the clients/patients of Corona del Mar to establish relationships that extend through multiple generations of pets. It is this close working bond of trust built between patients and owners over these many years that keep clients coming back for his compassionate care. Dr. Aten understands the value and importance of the bonds we share with our pets and wants to make sure each receives the same caring he gives to his own pets.

Dr. Liz Hanson


Dr. Liz Hanson was born and raised in Southern California. After completing a B.S. degree at the University of California at Davis, she attended Colorado State University School of Veterinary Medicine. Following graduation in 1995, she moved back to Southern California and has enjoyed practicing small animal veterinary medicine in Orange County ever since. Her areas of interest include internal medicine, dermatology, soft tissue surgery, and wellness programs.

The bond that is shared between a pet and its owner is what inspired Dr. Hanson to pursue a career in veterinary medicine. “One of the best parts of my job is not only when a patient is cured, but also when I see the joy an owner has when their pet is back to health!” Dr. Hanson has two miniature long-haired Dachshunds, “Peanut” and “Butter”, two leopard geckos, African cichlids, and a cat named “Martini.” When Dr. Hanson is not practicing Veterinary Medicine she enjoys watching her three sons compete in swimming and golf, and loves to cook, read, and most of all, travel.

Dr. Frances Tiberi


Dr. Frances Tiberi graduated from The Ohio State University College of Veterinary Medicine after completing a B.F.A. at the University of Utah. A native of Southern California, Dr. Tiberi returned to Orange County where she has practiced both emergency and general medicine for over 20 years. Dr. Tiberi’s interests include endocrinology, preventive care, geriatric/pediatric medicine and hospice/palliative care. She received K Laser certification in 2011. After serving as the Assistant Medical Director of a large Orange County practice for 3 years, she joined Corona Del Mar Animal Hospital in 2014. She is a member of the AVMA, CVMA, and SCVMA.

Dr. Tiberi has provided veterinary support for the Animal Care Center of Irvine, Irvine Animal Control, Russo’s Pet Experience, as well as the Cocker Spaniel Rescue of San Diego. She has experience in advocating for the veterinary profession regarding legislature before the City of Irvine Council alongside the CVMA. Providing compassionate animal care with a tender bedside manner is Dr. Tiberi’s goal. It is her passion to develop the human/animal bond through lifestyle plans for a comfortable and healthy pet. Dr. Tiberi resides in Ladera Ranch with her husband, two sons, two dogs, two cats, and a guinea pig. When she is not in the clinic she enjoys exercising, cooking, gardening, attending theater and dance productions and visiting the beach!

Our technicians are crucial in assisting the doctors to make sure your pet is given excellent medical care. They are involved with taking x-rays, collecting blood samples, placing IV catheters and ensuring that your pet’s medical condition receives professional care and oversight.

These are the first faces that you will meet coming to Corona del Mar Animal Hospital. These receptionists have many years of experience and will make sure your visit is friendly, caring and efficient for you and your pet. They have the knowledge and training to assist you with your pet’s needs.

These experienced staff members have been caring for the needs of pets at Corona del Mar Animal Hospital for over 20 years. They have a great respect for your pets and realize their importance as a family member. Our groomers, Nini and Rocci, will provide gentle handling and care during your pet’s grooming experience. Our boarding staff will give personal attention to each pet including daily outside potty breaks, providing premium diets and clean facilities.