Our Team

Dr. Mark Secor, DVM



Dr. Secor started practicing equine veterinary medicine in Orange County in 1985.  His ambulatory practice has been located at Rancho Sierra Vista Equestrian Center since 1996.  He specializes in lameness evaluation and treatment, care and treatment of performance horses (all disciplines), and various surgical procedures.


University of California, Davis - DVM, Veterinary Medicine (1980-1984)

University of California, Davis - BS, Mechanical Engineering (1975-1980)

Dr. Lauren Bowen, DVM



June 2015 - Doctor of Veterinary Medicine,  
St. George’s University School of Veterinary Medicine, Grenada  


June 2011 - Bachelor of Animal Science
California Polytechnic State University, San Luis Obispo, CA

Dr. Ceyla Linet Reynosa, MVZ



Ceyla has completed her Veterinary degree at University of Baja California, Mexico. She worked as a veterinarian assistant for one year at San Luis Rey Equine Hospital. After that she completed two years of internship at Alamo Pintado Equine Medical Center where she developed strong interest in equine anesthesia and ophthalmology and continues studying in those fields. After completing her internships she started her own equine ambulatory practice in Tijuana, Mexico. Besides running her practice she is also working to get her veterinary license in the States.

Dr. Jay Deluhery, DVM, CJF, C/EqD



Doctor of Veterinary Medicine – Virginia/Maryland Regional College of Veterinary Medicine, Virginia Tech – 2010


Bachelor of Science cum laude - 2006.  Major: Biology and Minor: Chemistry.  Henderson State University - Arkadelphia, Arkansas.


Certified by International Association of Equine Dentistry. Equine teeth floating.


Oklahoma Horseshoeing School – Master Farrier’s Certificate -1987

Robyn Tustison, RVT

Veterinary Technician


Robyn grew up in Alaska and moved to California to attend California State Fullerton University.


She later enrolled in the Veterinary Technology program at Mt. San Antonio College and received RVT license in 1982.


She worked extensively in the small animal field before joining Dr. Secor in 2002.

Michelle Sonntag

Office Manager


Michelle was born and raised in Southern California . She has been with our practice since 2008.  Michelle has ridden Hunter/Jumpers since the age of 8, and currently has two of her own horses which she rides Western and enjoys cow sorting and ranch riding, and trail.   She has a passion for country music and line dancing. Michelle also enjoys running, hot yoga and spending time on her family's boat in Lake Havasu City, AZ. 




Mark Secor DVM, Inc

31441 Avenida de la Vista

San Juan Capistrano, CA 92675



949 661-2225



949 661-8592




Office Hours

Monday - Friday

8:30am -5pm 



9am - 1pm office only