Everyone at Tillema Veterinary Clinic takes pride in their work. We love animals and use our knowledge and compassion in the treatment of every patient we see. Helping your pet live a happy and healthy life is why we come to work each day so we welcome you to stop and see what we have to offer.


Dr. Tillema

Dr. Tillema grew up on a dairy in a small town in West Texas. Dr. Tillema served in the United States Navy and then when his tour ended, he began his studies to become a veterinarian where he worked three jobs and went to school. Dr. Tillema began practicing veterinarian medicine in upstate N.Y. where his patients were big and small. He soon moved to California where he opened his own mixed practice as a mobile unit. Seeing that he was limited on what he could do for his small animal clients, Dr. Tillema opened a small animal practice in Corona. Dr. Tillema was injured by a bull and acupuncture was the only pain of relief that he had, after that incident Dr. Tillema studied acupuncture at the Chi Institute where he found that Western and Eastern medicine worked better together than any one alone. Dr.Tillema also has an interest in orthopedic medicine as well as general practice. When the Doctor isn’t working he enjoys skydiving, zip-lining, hiking, fishing, barbeques and watching and playing sports.


Maria graduated from Mt. San Antonio College with an Associate of Science Degree in Animal Health Technology. She has been a licensed Registered Veterinary Technician for 20 years. She has practiced in a variety of fields ranging from small animal hospitals to research and development. Prior to joining the Tillema Veterinary Clinic team, she worked for 12 years at an emergency and critical care facility. She has a large and varied family of pets in her household including dogs, cats, tortoises, rabbits, a chinchilla, a bird and a frog. Maria enjoys attending karate tournaments with her husband, son and daughter as well as collecting succulents and cacti and photography.


Sandra Frederick is our Vet Tech Assistant. She has been working in the veterinary field for 5 years. Her pride and joy is her appaloosa gelding Jake. Sandra has been showing competitively in the horse show industry since she was 10 years old where she holds multiple local championships and national titles with her horse.


Suzette Manzares has over 20 years of experience working in the pet care industry. From reception, veterinary assistant to mobile dog groomer, Suzette’s experience brings confidence and compassion to our front office. In her free time Suzette can be found spending time with her 3 kids, watching her son race professional speedway bikes or playing with her grandson. Suzette also shares her life with her Tennessee Walker, Pug and Miniature Schnauzer.


Jenn graduated from Carrington College with an Associates of Science in Veterinary Technology in 2017. She has been involved in the equine industry for over 10 years and has shown on the breed show level and open circuit as a youth rider resulting in multiple year-end championships and circuit awards. She has two BLM mustangs, one of which she competed with in the 2009 Extreme Mustang Makeover in Norco winning 10th overall.  Jenn shares her life with her husband, four miniature dachshunds, and two guinea pigs. In her spare time, she enjoys crossfit, running, and hiking.


Erin received her Bachelor of Science Degree in Animal Science, Production Management from Fresno State University. After graduation she started as an intern working for a Thoroughbred farm which quickly led to a full time position as an equine veterinary technician. For the next seven years Erin’s time was devoted to horses along with her other passion of racing mountain bikes. Through her competitive cycling, Erin met her husband which prompted a move to Southern California. From here, Erin went back to school to study Graphic Design and Advertising while obtaining a job working in a microbiology laboratory. All this adventure and experience has brought Erin to find a home working at Tillema Veterinary Clinic as the Practice Manager. Along with her husband, Erin has 2 young daughters and a happy-go- lucky Rhodesian Ridgeback named Easton.