Tustin Legacy Animal Hospital Team
Learn more about usMeet the Veterinarians & Team of Tustin Legacy Animal Hospital! We’re pleased to provide exceptional vet care for your pets!
Our Veterinary Team
Our veterinary team is a kind and caring group of experienced professionals that focuses on building a long-term, helpful, and meaningful relationship with you and your pet. We are attentive, responsive, and provide outstanding customer service. The team is led by Dr. Celine Hayek and Dr. Kristen Negvesky, two talented and experienced veterinarians who spend their days going above and beyond to make sure animals under their care are healthy and happy during scheduled appointments.
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TLAH is also very proud to have two Registered Veterinary Technicians (RVTs), Shelby and Balle, as well as two technicians trained in RVT programs, Katie and Yitzi, taking excellent care of your pets. RVTs go through additional schooling and must pass a rigorous set of national and state licensing exams to obtain their certification, delineating them as highly experienced and knowledgeable pet nurses. We’re so excited to have them on our team!
Dr. Hayek and Dr. Negvesky’s passion is education and helping pet owners understand how to best care for their furry family members. Not only are the doctors passionate about practicing high-quality, modern veterinary medicine, but they are also involved in the community. They eagerly participate in local events to share their knowledge and serve as a trusted source of information about pets.
Drs. Hayek and Negvesky met in 2015 while working at another hospital together, and they were instantly great friends. In 2017 they decided to band together and create their own hospital, a place where they can practice progressive medicine in a friendly, fun environment. They’re very supportive of each other and work together to ensure they have plenty of work-life balance and time to enjoy their personal lives and families. They also spend a lot of time together outside of work and like to try new foodie restaurants and go shopping and double dates with their husbands.
Dr. Kristen Negvesky
Likes
Anything to do with the beach and ocean; traveling with Alex, her amazingly supportive husband; riding her beach cruiser anywhere and everywhere; baking and eating pastries; watching movies & TV with aforementioned amazing husband; learning new things, and doing Pilates and yoga to help feel strong and balanced.
You may find her...
Esoterically quoting her favorite movies; entranced by petting kitties; staying up late for no good reason, and enjoying long conversations with friends and clients about anything and everything.
Personal Stats
An Air Force brat, she has lived all over the country but always came home in the summers to visit family in SoCal. Her mom, Sherry, is a dental hygienist, and her dad, James, is a hospital administrator. Her husband, Alex (did she mention how amazing he is?), is a computer systems engineer who manages a technology team for a financial firm. She has 2 cats named Fiona (rescued at 8 weeks old & is now 15 years old), who is a super sweet gray domestic shorthair who’s always by her side, and Morgan (rescued at 1 year old after spaying her in veterinary school for the local humane society & is now 7 years old) who is a crazy loving ball of fur tortie/calico mix. She and her husband excitedly welcomed their first child, Calvin, in November 2019.
Favorite Parts of Her Job
Dislikes
Mayonnaise (with the fiery passion of a thousand suns!); rude people; and waking up early.
Superpowers
Detecting heart murmurs in pets that others can’t hear; making friends easily, and a wickedly sarcastic sense of humor.
Professional Stats
DVM from University of Guelph (Ontario, Canada); MS from UCLA (Physiological Science); BS from UC Irvine (Neurobiology – zot zot zot!).
Favorite Medicine Topics
What Dr. Hayek Loves About Her:
Dr. Negvesky knows how to give her undivided attention to whomever she speaks with and really cares about you. She brings with her an exciting atmosphere that resonates with everyone in the room. In addition, she is a lovely friend and partner, and I am so excited to be working with her!
Dr. Celine Hayek
Likes
Milk or dark chocolate, creating fun flyers online for the hospital, traveling abroad, hiking, walking her dogs, jewelry making, trying new foods with her husband.
You may find her...
Relaxing in her backyard with her dogs, drinking tea, and soaking up the sun.
Personal Stats
Got married in 2017 to the love of her life, Jeff. He immediately got along with her dogs (made her love him even more), a Chihuahua named Dulce (De Leche), and a Jack Russell terrier mix, Pace. Dulce has been with her since her internship in Ventura, California, and Pace has been with her since her first year of working at a general practice in Orange, California. Our new hobby is hanging with our son, Leo.
Favorite Parts of Her Job
Meeting people with their pets and learning about them. Making sure that the people around her are happy and go home happy. Finishing up with a day that is filled with helping animals and their human friends.
Dislikes
Marzipan, coconut flakes (except for the real fruit), driving slow, people who dislike dogs and cats.
Superpowers
Taking photos of things from a different perspective and having them turn out awesome! Also great at working the microscope!
Professional Stats
DVM from St. George’s University, West Indies, with a clinical year at the University of Pennsylvania (2010). Two years of internships in Ventura, California, one year for multiple specialties, and the second year for Radiology and Oncology (2010-2012). Working as a DVM since 2010, with multiple years of animal experience before then; working toward being certified in Fear-Free medicine.
Favorite Medicine Topics
What Dr. Negvesky Loves About Her:
Dr. Hayek is very loving and kind and has a way of instantly putting people at ease. She always has a positive attitude and an infectious smile, spreading happiness wherever she goes. She is a wonderfully supportive friend in every way, and I’m so excited to share this journey with her!
Dr. Carissa Cruz-gsell
Likes
You may find her...
Personal Stats
Favorite Parts of Her Job
Dislikes
Superpowers
Professional Stats
Favorite Medicine Topics
Dermatology and surgery. And on the side, wildlife conservation medicine
Dr. Jon Nauss DVM, cVMA, CRPM, CMM, VBMC, Integrative Medicine
Please note: Dr. Nauss is exclusively seeing patients for integrative medicine only and is not available for general practice or routine veterinary appointments.
Shelby, RVT, Practice Manager
Shelby began her veterinary career at the OC Zoo at age 16, where she gained hands-on experience caring for a wide variety of animals, including mountain lions, bears, bobcats, prairie dogs, and bald eagles. A few years later, in 2015, she took her first job as a veterinary assistant, which ignited her passion for the field.
Determined to advance her career, Shelby attended Stanbridge University and became a Licensed Registered Veterinary Technician in 2020. During that time, she interned at Tustin Legacy Animal Hospital, where she further developed her technical skills and began strengthening her leadership abilities in practice management. She strives to uplift her team, foster growth in their skill sets, and support each member in reaching their fullest potential.
Outside of work, Shelby enjoys hiking, camping, backpacking, and playing/teaching the violin. She is also pursuing her CVPM Certification as she continues to grow in veterinary practice management.
What the doctors love about Shelby:
Shelby’s calm and compassionate nature shines through in everything she does. From starting as an intern to becoming a manager, she has grown tremendously, demonstrating unwavering dedication and leadership every step of the way. Her fairness, organization, and composed demeanor make her an exceptional leader who consistently brings out the best in everyone. The whole team adores her, and she continues to prove every day what an incredible manager she has become.
Liv, RVT, Lead Nurse
Hi! 🙂 My name is Liv, and I love caring for your fur babies! I graduated with an Associate’s Degree in Veterinary Science in 2019 and received my RVT license in 2020. Animals have been a passion of mine since I was very young- I knew that vet-med would be my calling when I first got my chubby boy Spyro (Puggle) and my spoiled girl Bella (Cheagle). When I’m not loving on your fur babes, I’m roller skating at the skatepark or watching horror movies with my boyfriend, Kenneth.
What the doctors love about Liv:
Liv’s easygoing and positive attitude makes her a joy to work with. She’s always open to learning and improving, takes feedback with grace, and offers thoughtful feedback in return. Her talent for client education and her special love for tiny, feisty dogs—who love her right back—make her truly one of a kind.
Katie, Veterinary Liaison
My name is Katie, and I have been a member of the TLAH team since 2018! I graduated with my AA in Environmental Science in 2011 and have worked with a couple of local nonprofit environmental groups before deciding that veterinary nursing was my true calling. I have loved and wanted to work with animals since I was very young, so choosing veterinary medicine was an easy decision! I went to Heritage College and OCVAS to get my VA certifications, and I have worked as a Veterinary Assistant since 2015. When I’m not at work, you can find me taking my Mini Schnauzer to the dog park, hiking/camping/enjoying nature, reading, or trying new restaurants with my best friends!
What the doctors love about Katie:
Katie has been with us since the very beginning, and her dedication shows every day. She’s friendly, knowledgeable, and meticulous—our go-to for facts, data, and research. Her caring approach helps our patients feel calm and comfortable, making every visit a better experience for pets and owners alike.
Aurelia, Vet Nurse
Hola everybody! My name is Aurelia
(pronounced Uh-rel-lee-uh), and I’m excited to care for your fur babies! I graduated with an AA degree in Veterinary Science in 2022, and I’m now working towards getting my RVT license, Lord willingly! I may be new to the team, but loving animals is not new to me! I grew up watching Steve Irwin, so I’ve had my share of caring for different types of pets. When I’m not here working with your fur babies, I’m either hanging with my family, friends, my boyfriend Derek, and or my dogs Finn and Molly! When I’m not here working with your fur babies, I’m either hanging with my Fiancé Derek, our chug dog Finnigan, Molly the Alaskan Malamute, friends, and my family!
What the doctors love about Aurelia:
Aurelia brings infectious positivity and energy to the hospital every day. She’s quick to learn, wonderful with clients, and always ready to lend a hand. Her upbeat attitude and strong sense of teamwork help keep our hospital running smoothly and our spirits high.
Luz, Vet Nurse
Hello! My name is Luz, and I’m excited to care for your fur babies! I graduated from Cal Poly Pomona in 2023 with a Bachelor’s degree in Animal Health Science and am currently working toward becoming an RVTg. My love for animals began at a very early age with my soul dog, Jackson (Dachshund), who has since passed but continues to inspire my passion for helping animals. In my free time, I enjoy going to baseball games, baking, and exploring new dessert and boba spots with friends and family. At home, I love spending time with my Chiweenies (Snoopy & Scooby), cats (Sushi & Shiro), and sulcata tortoises (Chip & Dip).
What the doctors love about Luz:
Luz is a calm, collected presence who makes every task look effortless. Her organization skills have elevated our surgical prep area, and her intelligence and teamwork make her a joy to work alongside. She’s a fast learner with a gentle, professional demeanor that patients and colleagues appreciate.
Stori, Vet Nurse
With over 14 years of hands-on experience in the veterinary field, Stori is a dedicated and compassionate Veterinary Technician known for delivering high-quality care to animals and trusted support to veterinary teams. Throughout their career, Stori has worked in a variety of clinical settings, including general practice, emergency care, and specialty clinics, developing a broad and adaptable skill set.
What the doctors love about Stori:
Stori’s expertise and enthusiasm make her a vital part of our team. What the doctors love about Stori is her fearless passion for surgery and emergency cases. She’s a skilled vet nurse who can fix just about anything — from complex equipment to a stressful situation. Always efficient, always teaching, Stori goes above and beyond to empower clients to care for their pets at home too.
Destiny, Vet Nurse
Destiny was born and raised in Orange County, California. She has always had a deep love for animals, starting in childhood when she would bring home any animal in need that wandered into her path. As soon as she was able to, Destiny began to volunteer at animal shelters. She took this knowledge she gained and found herself working as a manager of a doggy day care and boarding facility. After working with the daycare for a few years, she decided she wanted to venture into vet medicine. She started her career in vet med as a kennel attendant, then quickly became a vet assistant, and her love of animals and vet medicine continues to grow each day. She has been working as a veterinary assistant for close to 6 years now and has been working towards furthering her education. It is her dream to one day work with wildlife as well start her own animal rescue and farm sanctuary, so she can provide a loving home to animals in need. In her free time, she enjoys spending time hiking with her dog Meadow and lounging around reading with her two cats, Amelia and Nymeria.
What the doctors love about Destiny:
Destiny’s nurturing personality creates a sense of calm wherever she goes. She’s sweet, friendly, and always eager to learn new techniques that benefit our patients. Her reliability and follow-through ensure that every pet in her care receives thoughtful, attentive treatment.
Kayla, Veterinary Assistant
I’m thrilled to introduce myself as one of the veterinary assistants at TLAH! I graduated with my B.S. in Biological Sciences from UC Irvine in 2023. Currently, I am pursuing my Master’s degree in Comparative Biomedical Sciences, with the aspiration of becoming a DVM one day. My journey of loving and caring for animals began at a young age, starting with my dog, Roxy, and my cat, Mika. When I’m not at work, I enjoy spending time with my family, playing video games, and watching all kinds of movies with my boyfriend, Nick.
What the doctors love about Kayla:
Kayla’s empathy and warmth make her a comforting presence for pets and people alike. She listens deeply, learns eagerly, and brings a bubbly, motivated energy to the team. Her compassion and curiosity remind us all why we love what we do.
Angela, Veterinary Assistant, Client Service Representative
I’m so honored to be working at Tustin Legacy Animal Hospital! I received my Kennel Attendant Certificate at OCVAS in November of 2024 and have since earned not one, but 2 titles with TLAH! I am happy to be one of TLAH’s Technician Assistants and Client Service Representatives! I may be new to the field but my love for all animals started at a very young age. I grew up with 3 cats and 1 dog who have now crossed the rainbow bridge. My current fur babies are, Ruby (15 years old) and Kenny (6 years old). They are both dogs and are my pride and joy! If I’m not at work caring for your fur babies, I am hanging out with mine or watching movies with my boyfriend and best friend Niko.
What the doctors love about Angela:
Angela’s professionalism and care make her stand out in every way. She’s an excellent communicator, both with clients and the team, and she never misses a follow-up. Her organization and compassion ensure that every patient—and every person—feels informed, supported, and valued.
Frida, Client Service Representative
Hi! My name is Frida! I have been in the field for over 5 years as a customer service representative, a passionate animal lover with a knack for pawsitive communication! I specialize in supporting pet parents with care, compassion, and clear answers. I have a deep love for animals and a dedication to exceptional service, I bring heart, patience, and knowledge to every interaction. Whether assisting pet parents with questions, resolving concerns, or offering guidance on care, my goal is to make every experience as smooth and stress-free as possible—for both humans and their furry family members. I have three fur babies myself, two cats Luna, Espooky and my rabbit Boo. On my free time you can find me at a theme park or staying at home with my pets watching Harry Potter or at an Anaheim Ducks hockey game! 🙂
What the doctors love about Frida:
The doctors love Frida’s endless positivity and kindness. She’s always friendly, always caring, and never without a smile. No matter how busy the day gets, Frida’s upbeat attitude keeps the whole team in good spirits.
Yvonne, Client Service Representative
With over 20 years of experience in customer service, I’ve worked in the veterinary field since 2015, including two years in the speciality of animal ophthalmology. My journey and love for animals (including my rainbow bridge angels, Koda and Honey) led me to Tustin Legacy Animal Hospital, where I continue to provide dedicated care. Outside of work, I love spending time with friends and family, being outdoors (hiking, camping, backpacking), running , reading and creating unique outdoor experiences that connect our OC and LA communities with nature.
What the doctors love about Yvonne:
Yvonne’s warm smile and bubbly personality make clients and coworkers feel instantly at ease. Her calm demeanor and eagerness to learn are matched by her excellent communication skills, making her a trusted and beloved member of our team.
Destinie, Marketing and Event Planning Coordinator
My role in the hospital is a client service representative and I’ve been in this industry since 2019. I have 2 dogs, a chiweenie named Kobe and a pomchi named Ella. My love for animals began as a child as I have grown up with nothing but dogs, birds, fish, hamsters, and guinea pigs. On my free time I enjoy painting, making strawberry and flower arrangements, going to the gym, and listening to music. I also enjoy hiking, trying new food spots, and hanging out with my friends and family. And although I am an introvert, I do enjoy interacting with new people, and I can’t wait to interact with you!
What the doctors love about Destinie:
Destinie brings creativity and modern flair to our hospital, always keeping us up to date with the latest social media trends. She’s a caring teammate who lifts up those around her and makes our workplace both connected and inspiring.
