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Meet The Staff


Annette Ortmayer, DVM

Dr. Ortmayer finished her undergraduate studies at Montana State University. She went on to Colorado State University to receive her Doctorate in Veterinary Medicine (DVM) in 1985. After graduating, she joined Covina Animal Hospital as an associate Veterinarian. When Dr. Chatfield retired in 1994, Dr. Ortmayer and her husband Rick purchased the hospital and still own it today. Dr. Ortmayer's interests include photography, traveling, and hiking with her dogs Bentley, Baxter, and Percy. She also shares her home with 4 cats: Jack, Squirt, Enzo and Pete.

Laurie Kelban, DVM
Medical Director


Dr. Kelban obtained her B.S. in Zoology, completed her Masters degree in Cellular and Molecular Biology at Cal State University Northridge, and then went on to the University of California - Davis to earn her DVM in 1989. She joined the staff of Covina Animal Hospital in April of 1990 and has been a valuable member of our team ever since. She has a strong interest in radiology and heads up our ultrasound team. Along with her husband and son, Dr. Kelban has a chocolate lab named Luke and a cat named Herschel.

Jessica Chen, BVM

Dr. Chen finished her B.S. in Veterinary Medicine at National Taiwan University and Cummings School of Veterinary Medicine at Tufts University in Grafton, Massachusetts. She then completed her internship at Michigan State University in small animal medicine. She was born in Beaumont, Texas and is fluent in Mandarin Chinese. Dr. Chen has a strong passion for feline medicine. She has one cat, Shrek, that she adopted while at Michigan State University. When she is not at the clinic, she loves to spend time with her husband and young daughter in their new home.

Lisa Contreras, DVM


Dr. Lisa Contreras graduated veterinary school from Western University of Health Sciences in Pomona, California in 2007. She joined Covina Animal Hospital in May of 2015. Dr. Contreras grew up in the Covina area and is happy to find a career close to her hometown. She is married and a proud mother of a young boy and a cat. Her veterinarian interests include orthopedic and general surgery as well as alternative medicines. Even with her busy family life, she still finds time to play soccer competitively.

Melissa Roth, DVM

Dr. Melissa Roth joined our Covina Animal Hospital family in May of 2016. She was born in San Diego where she worked as an animal caregiver and adoption counselor for the San Diego SPCA. From there she completed her undergraduate requirements at UC Davis and moved to Louisiana. She attended the Louisiana State University School of Veterinary Medicine, where she discovered her passion for small animal medicine as well as animal advocacy. Prior to joining our team, Dr. Roth worked with a company called Lap of Love that provides in home care for families who want their pets to be at home but comfortable in their final stages of life.

Angel Auyeung, DVM


With a love for science and animals, veterinary medicine was a natural choice for Dr. Auyeung after her undergraduate studies at UCLA. Go Bruins! Dr. Auyeung obtained her veterinary medical degree from Western University of Health Sciences and completed a 1 year small animal rotating internship in San Diego. She worked as a general practitioner/ER veterinarian at a 24 hour facility in Upland, CA before starting at Covina Animal hospital. Her interests include emergency and internal medicine. During her downtime, she enjoys spending time with her husband, two kids, cat "Neko" and corgi "Mitchell."


Practice Manager


Jake became an official part of the Covina Animal Hospital Staff in September of 2014 as the Practice Manager, though he was no stranger to our staff. Growing up, Jake would often help out his parents, Dr. Ortmayer and Rick, here at the hospital when needed. He received his bachelors degree from UC Davis and his goal is to become a certified practice manager by the end of 2017. Jake enjoys weight lifting and learning about the veterinary industry. He is very passionate about making Covina Animal Hospital an amazing place to work as well as providing the best service and medical care for your four legged family members. Jake and his long-time girlfriend have two cats, Bingo and Snowball.

Office Manager

hmHeidi joined the Covina Animal Hospital family in October of 2001. She attended Covina High School and then continued her education at the University of La Verne as a Biology Major. When she is not at work, she loves to go hiking with her bulldog, playing World of Warcraft, photography, watching and participating in various sports, and trying out new vegan recipes. Her family includes her 13 year old son and a plenty of fur-babies. Her goals are to be the best mom she can be to her son, be a successful leader at Covina Animal Hospital, to help provide the best customer service, and to just have fun with life!


Rewards Program Director

Amanda joined the Covina Animal Hospital staff in June of 2014. She moved back home to California from Arizona, and has been working as a veterinary receptionist for 10 years. Her hobbies include hiking, cycling, watching movies, and spending time with her husband and 2 dogs, Moco and Tito. Her goal is to retire early and travel the country in an RV.

Lead Receptionist
Weight Loss All Stars Program Director

Kellie joined our team in June of 2016. As a part of the CAH staff she runs our Weight Loss All Stars program and was quickly promoted Lead Receptionist. Kellie attended East LA Community College for psychology but, after having her son, she decided to focus on raising a family. When she is not working, she is busy raising her 2 year old son and 4 year old step daughter. She is also a food enthusiast and enjoys hiking.


Analise joined our staff in June of 2016. She graduated from UCLA with a degree in biology and a minor in Theater. Her ultimate goal is to get her DVM license focusing on either small animal medicine or wildlife conservation. Her interests include relaxing at home, reading a book or watching TV, going to the beach, and hanging out with her friends.


Jessica began working with our team in October 2016. She has an AA in Natural Sciences and one class to go before getting her AS in Business Administration from Mt SAC. After that she plans on continuing her education focusing on veterinary practice management. On her days off she enjoys being outdoors, hiking and going to the beach. She also likes relaxing with a comic book or watching TV. She has a 10 year old cat named Jade, a 2 year old German Shepherd named Willow, and a Cockatiel named Rosie.



Marie has been working in veterinary medicine for 4 ½ years and joined our reception staff in May of 2017. Marie started her career as a volunteer at the Riverside Animal Shelter. In 2011, she helped a shelter in Memphis, TN during a tragic flood incident. It was during this mission that Marie realized her passion. In addition to helping animals, Marie volunteers with Heal the Bay and a children’s orphanage in Tijuana, Mexico. In her spare time, she loves to travel, volunteer, attend concerts, drink coffee, and watch sports. Her travel goals are to visit a different country and a different state every year and to visit all the baseball parks in the US. At home, Marie as crazy, 1-year-old Rottweiler appropriately named “Rotten Charlie.”



Lisa started working here part time in 1988 and then retired for 15 years to raise her family. As soon as her five kids grew up she came right back to work full time in 2015. Lisa also worked as a preschool teacher for 27 years, but feels that working here is incredibly rewarding, fun, and just makes her happy! In addition to her husband and five beautiful children, Lisa has one grandbaby, five dogs, and two cats. In her spare time she loves to go to dog parks, dog beaches, visit her grandson, and travel with her family.

Veterinary Assistants

Lead Front Assistant


Christine, a 2009 Animal Science Grad from Cal Poly Pomona, joined Covina Animal Hospital in the summer of 2006 as a veterinary assistant. Now a Lead, she oversees and supervises 5 front veterinary assistants for our rapidly growing practice. Having grown up with chihuahuas all her life, she quickly earned the her title “The Chihuahua Whisperer” from our beloved clients. When it comes to these little creatures, her motto has always been "the feistier, the better!" Christine has 3 little chihuahuas of her own, as well as her late chihuahua, Sugar, and her late golden retriever mix, Gary, whom she holds near and dear to her heart. On her days off she enjoys spending time with her fiance and snuggling up with her fur babies while watching a good horror flick. She is also an avid collector and huge fan of Tim Burton’s The Nightmare Before Christmas.

Social Media Director

msMackenzie joined our team in April of 2016. She grew up on a farm in Massachusetts and moved to California to go to school and find her passion. She has a B.A. in Psychology from Chapman University and is now in the Veterinary Technology Program at Carrington College. Her goals are to become a licensed veterinary technician and to continue pursuing her passion for exotic and companion animal medicine and behavior. When she's not working, studying, or volunteering with wildlife, Mackenzie enjoys adventurous weekend getaways with her fiancé. More than anything, though, she loves lounging at home with her 3 dogs and her newly rescued kitten.



Stephanie joined our team in August of 2016. She went to school at Cal State Long Beach and graduated with a BS in Marine Biology. She plans on eventually going back to school to become an RVT. When she's not working she likes to read and have fun with her pets. Stephanie has two crazy dogs and three loving cats at home.



Cynthia graduated from Carrington College and joined our team in September 2017 and brings 4 years of experience working with animals. She started out volunteering with the Inland Valley Humane Society and then started working in hospitals when she enrolled at Carrington. One of her favorite aspects of this field is educating clients and seeing their pets’ health improve. In her spare time, Cynthia enjoys shopping, traveling, hiking, and going to the park and beach with her frenchie, Bella. Cynthia also has a cat named Kitty!

Lead Back Assistant

shaneShane started working at Covina Animal Hospital in August of 2004. He was hired on as a Kennel Assistant and then was later trained on the job to become a Veterinary Assistant. He has attended both Pasadena City College as well as Citrus College. His interests outside of work include sports, sports and did we mention sports? He plays hockey & football and he runs 3 fantasy sports leagues: football, baseball, and basketball. He is working toward becoming a homeowner and works hard to keep his wife happy. Together they have 2 dogs, Dallas and Emmitt, and 2 cats, Sergei and Rousey.

Registered Veterinary Technician


Irene always knew she wanted to work in veterinary medicine. She attended Mt. San Antonio College and received a degree in animal science before becoming a Registered Veterinary Technician. Irene joined Covina Animal Hospital in March of 1983 and has been a valuable asset to the team ever since. When she is not working she enjoys trying new recipes and spending time with her friends, her 3 dogs, and her 5 cats.

Registered Veterinary Technician


A Carrington College graduate, Andrea joined our staff as a Registered Veterinary Technician in May 2017. She loves spending her days off with her 5 year old daughter and their German Shorthaired Pointer, Whiskey. Oh, and going to Disneyland of course. Someday she’d like to specialize in veterinary dentistry and rehabilitation.

Registered Veterinary Technician


Christine graduated from Heritage College and soon after got her license as an RVT. She joined Covina Animal Hospital in July of 2015 and has proven herself an excellent technician, coworker, and friend. Christine manages our staff birthday parties and makes sure everyone gets what they want on their special day, such as churros, sea salt caramel coffee, or a wiener dog shaped cake - just to name a few of our odd requests. A foodie at heart, Christine enjoys trying new restaurants, ordering crafted cocktails, and finding exquisite eateries with her long-time boyfriend. When she's not working or going out to eat, she's relaxing with her bull terrier, Joey (aka "Boodie" aka "Bûlée"). He even has his own instagram! (@creme_bullee)

Registered Veterinary Technician


Denisse became a licensed technician in April 2017 and joined our family in September 2017. She is incredibly passionate about the health and well being of animals and specifically chose to work here because of the quality medicine we provide and the dedication and care we have for our patients! Her own furry family consists of 3 dogs, 2 cats, and a ferret. Overall, Denisse is looking forward to growing as an RVT and would like to eventually specialize in a certain area of veterinary medicine. In her spare time, she likes to play guitar, “Netflix and chill,” and EAT!

Kennel Assistants

Lead Kennel Assistant


Jenna began working at Covina Animal Hospital in June of 2016. She currently attends Mt. San Antonio College where she will receive her A.S. in Animal Science and hopes to continue her schooling to obtain a B.S. in Animal Behavior. Her goal is to fill CAH with a variety of new enrichment devices and activities to ensure your pets have the best possible stay with us! When Jenna isn't working, she likes to volunteer with various animal rescue groups, practice modern dance, scuba dive, travel, and be silly with her friends. Her family consists of her awesome husband Pedro, their 2 marvelous cats (Sasha and Captain) and their newest family member, Mango, a rescued Golden Retriever.

Kennel Assistant

juliaJulia joined Covina Animal Hospital in May 2017 after working with the retired racing greyhounds at Mt. SAC. She is currently in school to obtain her animal science degree from Mt. SAC and plans to become a Registered Veterinary Technician after she graduates. When she’s not loving up on her 3 adorable cats, Julia enjoys reading, nature photography, swimming, video games, and baking yummy sweets.


Kaza joined Covina Animal Hospital in April of 2016. She has a passion for felines and finds herself rescuing any cat that needs her help. She loves everything that involves nature, and she especially loves to hike and take photographs of her son. Along with her long-time boyfriend, Kaza lives with four cats - Mowgli (her favorite), Snow, Bug, and Church.


rhRaylene graduated from UC Davis in 2015 with a Bachelor's degree in marine biology. She later moved back down to SoCal and joined our staff in early 2016 with a goal of one day becoming a veterinarian. On her days off, Raylene likes to read and go to the beach, but you can also find her at Starbucks or cuddling with kittens. Her family consists of her Yorkie, Lyla, and her recently rescued kitty, Axel.



Martha began her relationship with our hospital as a client and eagerly applied to join our staff this summer. She is currently in the RVT program at Mt. SAC but is undecided as to whether or not she wants to be a veterinarian or a veterinary technician - it's a tough choice! When she's not loving up on all the patients that come to our treatment area, Martha enjoys binge watching Netflix and spending quality time with her sister. At home, Martha has a dachshund named Chiquita and a chihuahua-mix named Lucky. She is also a crazy dachshund lover so, naturally, Chiquita is her favorite (shhh!).


Forever our most valuable team member, meet our housecat, Spaz! True to her name, Spaz has quite the odd personality. She came to us as a stray in 2007 and has finally started to accept us as her own. You will likely see her through the window of the Cat Condos, perched on her cat tree taking just one of her many, many naps of the day.