Jake Waas,
Practice Manager
Heidi Magner,
Office 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 in 2014. 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 live in La Verne with their cats, Bingo and Snowball, and their rescue dog, Java.
Heidi 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 furbabies. 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!
Annette Ortmayer, DVM
Laurie Kelban, DVM
Medical Director
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.
Dr. Kelban obtained her Bachelor's Degree in Zoology and completed her Masters degree in Cellular and Molecular Biology at Cal State University Northridge. She then went on to UC Davis School of Veterinary Medicine to earn her DVM License in 1989. Dr. Kelban 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. In 2017, she took on the role of Medical Director and ensures that our doctors and support staff are up to date with the latest medical research and that we are always providing the highest quality medical care to our patients.  Along with her husband and son, Dr. Kelban has a chocolate lab named Luke and a cat named Herschel.
Lead Technician
Christine A.,
Lead Vet. Assistant
Shane 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, Rousey and Dez.
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 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.
Customer Service Representative
Fear Free Coordinator
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.
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 to 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 with her 2 year old son and 4 year old step daughter. She is also a food enthusiast and enjoys hiking.


Jessica Chen, BVM
Laurie Kelban, DVM
Medical Director
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.
Dr. Kelban obtained her Bachelor's Degree in Zoology and completed her Masters degree in Cellular and Molecular Biology at Cal State University Northridge. She then went on to UC Davis School of Veterinary Medicine to earn her DVM License in 1989. Dr. Kelban 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. In 2017, she took on the role of Medical Director and ensures that our doctors and support staff are up to date with the latest medical research and that we are always providing the highest quality medical care to our patients.  Along with her husband and son, Dr. Kelban has a chocolate lab named Luke and a cat named Herschel.
Angel Auyeung, DVM
Lisa Contreras, DVM
Dr. Contreras graduated from Western University of Health Sciences in 2007 and joined Covina Animal Hospital in May of 2015. She grew up in the Covina area and is happy to find a career close to her hometown. Her medical interests include orthopedic and general surgery as well as alternative medicines. In 2017, Dr. Contreras completed seven months of training through the Chi Institute of Traditional Chinese Veterinary Medicine to earn her certificate in Small Animal Acupuncture. By March 2018, she is anticipated to earn her certificate in Food Therapy. Even with her busy work and school schedule, Dr. Contreras still manages to play competitive soccer and spend time with her husband, son, their two kitties, Scout and Blackberry.
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, and their cat, Neko.
Melissa Roth, DVM
Karryssa Fenderson, DVM
Before joining our team, Dr. Fenderson received her Bachelor's in Animal Science and Dance at Cornell University and later her DVM license from UC Davis. She has been working in the veterinary field since high school volunteering at animal shelters, small animal clinics, wildlife rehabilitation centers, and even did veterinary work with wildlife in South Africa. In addition to clinical medicine, she has also participated in research with rainbow trout as well as the the hearts of Great apes! Her primary interests now include internal medicine, cardiology, dermatology, and anatomic pathology. Before she could even pronounce “veterinarian,” Dr. Fenderson knew she wanted to be a voice for animals. In her spare time, she enjoys exploring the outdoors, cooking, and sifting through Yelp reviews for the best vegan food. You can also find her training for half marathons around the local roads and trails, or dancing at a local ballet studio. Her heart and home are currently occupied with a rabbit named Harley and a chocolate lab named Corduroy.
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.


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.
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.
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.
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.
Destiney has been a member of our hospital family since March 2017. She is currently enrolled in the animal science program at Mt SAC and previously volunteered at an exotic animal sanctuary. She is driven by her love of animals and the joy they bring to her life. When she’s not at the hospital loving up on puppies, Destiny likes to play sports (volleyball, golf, & softball), watch movies, hang with friends, and play board games. She has 3 pets at home - a German Shepherd named King, an old kitty named Krista, and a crazy kitty named Taz.
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 has a crazy, 1-year-old Rottweiler appropriately named “Rotten Charlie.”
Bio coming soon!
An RVT student at Mt. San Antonio College and an avid volunteer for Fast Friends Greyhound Rescue group through Mt. SAC, Alex strives for excellence in the veterinary field. Alex is one of our newer staff members, joining our family in May of 2018. When Alex is not powering through her work day, she enjoys reading, dancing, playing one of the 7 different instruments she’s learned, and spending quality time with her close friends and family. For cuddles she turns to her baby turtle named “Jean” that she recently adopted. Alex is looking forward to adding her own personal touches to Covina Animal Hospital to make sure each patient’s visit is special.
Bio coming soon!

Veterinary Assistants

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.
Carolina has always had a passion for veterinary care. She started at our hospital in August of 2017 but brought with her 2 ½ years of experience and is currently working on her BA in Biology so she can apply to veterinary school. Even while home, Carolina is always seeking opportunities to volunteer at animal shelters, brushing up on her technical skills, and learning about any new changes or trends in the veterinary field. Carolina is also a chihuahua fanatic (second to Christine A.). She has one cat named Nala and five Chihuahuas, Lola, Noni, Candy, Blackee, and Patootie.
Karen, CVA
After working at Quality Care Animal Hospital for 3 years, Karen transferred to our hospital so she could continue caring for her same patients. When she was younger, she lived down the street from Covina Animal Hospital with her own dogs and cats. Seeing pets walking in and out of our clinic inspired her to work with animals. Karen went to school at Mt SAC and later attended Animal Behavior College to become a Certified Veterinary Assistant.  In her spare time, Karen likes to play tennis, hit the gym, eat pizza, and watch Game Of Thrones. She has 3 cats named Baby Girl, Bad Girl, and Fat Girl, and a husky named Blue.
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!
Project Manager
Social Media Rep.
A true cat lover and pitbull enthusiast, Amber started her career in veterinary medicine so she could be a voice of advocacy for all animals big and small. After just a few months of working at CAH she started managing our social media platforms, using them to continue educating pet owners outside the exam room and share what it means to be a patient at Covina Animal Hospital. When she’s not posting cat memes or recording hospital shenanigans, Amber loves taking her rescued pittie on long hikes at the local trails. Along with her pitbull, Trixi, she has a loveable (not really) seal-point cat named Sage.
Originally a farmer's daughter from Massachusetts, Mackenzie moved to California in 2012 to go to school and find her passion. She completed her B.A. in Psychology at Chapman University in Orange, CA and is now expected to graduate from the Veterinary Technology Program at Carrington College in late 2018. Her goals are to become a licensed veterinary technician and to continue pursuing her passion for animal medicine and behavior.  When she's not calling dibs on all the dachshund appointments, she's working behind the scenes with the management team, making sure our doctors, support staff, clients and patients all go home happy at the end of the day. Mackenzie enjoys evenings by the firepit at local restaurants and adventurous weekend getaways with her fiancé. More than anything, though, she loves lounging at home with her dachshund named Bean, 2 chihuahua's Smith and Rudy, and her rowdy kitten named Kiwi.
Julia 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.
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 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 doxie lover so, naturally, Chiquita is her favorite (shhh!).
Bio coming soon!
Bio coming soon!

Veterinary Technicians

Irene, RVT
Starting as a kennel attendant and working her way up, Nadine has been working as a technician at CAH for 15 years. She obtained her Animal Science degree in Veterinary Technology from Mt. SAC while working full time at our hospital. The most rewarding part of her job is knowing she works with a great team giving the best support and medical care for her patients. At home, Nadine lives with her hubby, their two beautiful girls, and a spoiled little chi chi named Tiramisu.
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.
Christine N., RVT
Justine, RVT
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 fiance. When she's not working or going out to eat, she's relaxing with Willy, her rescued bull terrier. For all our fellow bull terrier lovers, Willie and Joey (Christine's late bullie), have their own instagram! (@creme_bullee)
Originally a nursing student, Justine came to her senses and chose to pursue her passion for animals by becoming a licensed technician in 2014. Her childhood dream was to be a veterinarian but she absolutely loves her job as a technician. Justine just joined our family in December of 2017 and she has found the perfect match. She loves the passion that her new colleagues have for our patients and is looking forward to developing her own relationships with our clients. In her spare time she likes to spend time with family, take her dogs to the beach or park, read, eat, and most importantly, sleep. She has two dogs - a retriever/lab/collie mix named Petunia and a chihuahua/pomeranian mix named Ginger. Justine describes Petunia as a big love bug while Ginger is a mean old lady, but her “ride or die” nonetheless.
Denisse, RVT
Andrea, RVT
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! In September of 2018 she became certified in Companion Animal Laser Therapy 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!
A Carrington College graduate, Andrea joined our staff as a Registered Veterinary Technician in May 2017. She also became certified in Companian Animal Laser Therapy in July of 2018 and would someday like to specialize in veterinary dentistry or rehabilitation. Andrea loves spending her days off with her 5 year old daughter and their German Shorthaired Pointer, Whiskey. Oh, and going to Disneyland of course!
Simon, Surgical Tech
After graduating from Cal Poly Pomona, Simon had his start in emergency and critical care before switching to general practice. He is now the primary surgical technician for all of our doctors and he is the king of dental procedures. Simon has attended hundreds of hours of continuing education through the San Diego Veterinary Dental Training Center and is on his way to becoming a certified veterinary dental technician. When he’s not cleaning teeth or fixing everything we break at the hospital, Simon loves watching movies and going to Disneyland with his wife and daughter. He is also the proud father of two cats, Zepplin and Chonkee, and a tarantula named Ariel.