Meet Our Veterinary Team

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Beth Spencer, DVM

Medical Director

Dr Beth Spencer brings patience, perseverance, and compassion to her practice. As a Fear Free certified veterinarian, Dr Spencer takes time to work with pets so that they are comfortable during their visit. She emphasizes wellness and preventive care so her patients can stay happy and healthy.

Dr Spencer is dedicated to clear communication, helping her clients understand their pets’ health care options. She also coaches the next generation of veterinarians in their CSU communication labs every year.

As a parent, Dr Spencer strives to create a kid-friendly environment with snacks, books, and coloring. She always enjoys answering kids’ questions, knowing she might be inspiring a child to become a veterinarian!

Dr Spencer completed her undergraduate studies at Yale University and received her Doctor of Veterinary Medicine (DVM) from the Ohio State College of Veterinary Medicine. On weekends, Dr Spencer enjoys hiking, camping, skiing, reading, movies, and spending time with her husband Eric, her kids Phoebe and Shane, and her 2 dogs Mobi and Brownie.

Penn Chinudomsub, DVM


Dr Penn’s hardworking, down-to-earth personality and clear communication are just a few of the reasons her clients love her. She insists all of her patients have positive experiences at Goodheart, so she adjusts to their individual personalities and uses positive reinforcement and Fear Free techniques.

By attending large conferences every other year, Dr Penn stays informed and updated on her ever-evolving profession. She also keeps current by enrolling in continuing education events offered by local specialists in between conferences and subscribing to weekly veterinary podcasts.

Dr Penn believes that biannual preventative care is the best means of avoiding major health issues. She is especially interested in dentistry and soft tissue surgery. She is also passionate about shelter medicine and providing for shelter animals. Dr Penn has traveled abroad to provide veterinary care for under-resourced communities.

Born and raised in Southern California, Dr Penn received her undergraduate degree from the University of Wisconsin and attended veterinary school at Oklahoma State University. When not at Goodheart or traveling, she enjoys running, skiing, cooking, gaming (both video and board), photography, arts, and crafts. Her and husband Ryan share Lux, her cat that she adopted when she lived in St. Kitts, and her former barn cat, Kaylee.

David Liss, DVM


Dr David Liss’s clients love his compassionate and thorough approach to veterinary medicine. He empowers his clients to make the best choices for their pets, taking time to discuss all aspects of a treatment plan, its pros, and cons, and answer any and all questions. This way, Dr Liss ensures pet parents feel comfortable with and educated about their pet’s health plan. Clients also appreciate his empathetic, easy-going, and humorous personality.

Dr Liss is Fear Free and Low-Stress Handling certified. So, he can read the patient body language and change his tactics if he notices a pet start to get nervous.

He received his undergraduate degree from Emory University, where he double-majored in Biology and Psychology. He graduated with his DVM from the University of Illinois. And he completed his internship at Colorado State University. Dr Liss loved the Centennial State so much he decided to settle in Denver.

In his free time, Dr Liss enjoys concerts and music festivals. He also loves hiking, snowboarding, and exploring Denver’s food scene. While Dr Liss loves all animals, he is partial to cats. His two Tuxedo cats, Cosmo and Roo, have stolen his heart.

Cassie Jensen, DVM


Dr. Cassie Jensen empowers pet parents to make the most informed decisions for their pets through high-quality communication at appointments. She wants her clients to understand how their pet is doing. Whether she’s seeing well pets or sick pets, she feels happier when she knows she helped someone understand how to better care for their pets.

These skills have helped her build beautiful patient-client-veterinarian bonds. Clients love her kind, positive personality. They love the time and attention she gives to each patient.

Dr. Jensen reads pet body language cues so that if a pet gets nervous, she falls back on treats and tools to help calm the pets.

She stays current on veterinary skills through continuing education webinars and twice-monthly issues of veterinary journals. She also aims to pursue certificates in Fear Free, nutrition, and feline medicine.

She graduated with a Biology degree from Purdue before receiving her DVM at the University of Minnesota. She hikes in the summer and skis in the winter. She also loves reading, traveling to see family and friends, and brewery hopping. She is a dog mom to Hank, an old English bulldog, and Thomas Jefferson (“TJ”), a domestic shorthair cat.

Elisa Rodgers

Certified Veterinary Technician

Elisa Rodgers really listens to client concerns and goes the extra mile for all the pets she sees at Goodheart. She is compassionate and comforting to both clients and their animals. She makes appointments easier with clear communication and ensuring all concerns are addressed.

A certified vet tech since 2015, Elisa keeps her job skills current by attending continuing education seminars and reading technical journals. She is particularly interested in aging and arthritis in dogs. Plus, she enjoys educating pet parents on enrichment and the importance of wellness exams.

With an empathetic heart, Elisa has filled her home with lots of animals: Louise, the bearded dragon; Joey Ramone, the leopard gecko; Francis, the cat; Cher, the long-haired guinea pig; and, finally, the best dogs in the world, Bodhi and Spratt, the terriers and Miss Fancy Pants, the Chihuahua.

Rachel Hoelzer

Veterinary Technician

Rachel brings a sense of understanding and empathy to clients and pets alike. She enjoys helping clients make the most educated decisions for their pets by ensuring they don’t leave with any unanswered questions. Rachel also strives to make visits to Goodheart Animal Health Center stress-free and comfortable by helping to ease our patient’s pain or anxiety.

Rachel loves learning new things so she can continue to educate clients effectively. She keeps current on veterinarian medicine by following interesting case studies and attending continuing education seminars. She is particularly interested in anesthesia and pet behavior.

Rachel adopted her sweet, funny dog Dylan in April 2019. He is a deaf two-year-old Australian Stumpy Tail Cattle Dog. She also has Gir, a big man stuck inside a little dog’s body. He is a 12-year-old Cairn Terrier mix who has been with her through seven moves and even across state lines. He is such a dapper gentleman!

Callie Moore

Certified Veterinary Technician

Callie Moore’s genuine compassion and patience make every patient that comes in feel as if they were hers. Clients appreciate her positive, upbeat attitude, and her professional manner allows clients to feel respected and heard.

A dedicated lifelong learner, Callie loves to learn using continuing education classes and seminars. She has a soft spot for senior cats and doing all she can to help them be healthy and comfortable.

When not loving on our patients, she spends her free time dancing, doing yoga, traveling, and spending time with friends and family. She has 2 cats, Leo and Romeo, Kylo, her German Shepherd mix, and Spike, the Hedgehog.

Lisa Hapgood

Veterinary Technician

Lisa is an excellent communicator who enjoys getting to know each patient. Clients appreciate that she is empathetic and detailed. Because she understands how stressful going to the vet can be, she tries to keep patients entertained and comfortable. She also takes time to thoroughly explain procedures to clients and answer any questions they may have.

While Lisa went to school to become a veterinary technician, she continues to attend seminars and classes to expand her job skills and knowledge. She loves all dogs and feels comfortable with nervous cats. When not working, she likes to train her two dogs, Swerve (Border Collie) and Amaze (Border Collie/Whippet), for flyball competitions. She also has a pet cat.

Rishelle Halbert

Veterinary Technician

Rishelle understands that a comfortable pet makes a happy client. Therefore, she takes time to ensure that clients understand treatments, diagnoses, and recommended lab work. Rishelle is easy to talk to and enjoys answering any questions clients may have. Her friendly nature and patience with all animals allow her to make visits easy and stress-free for clients and patients. She is an advocate for preventative lab work, vaccines, and yearly exams so that patients live happy, healthy lives.

Rishelle studied at Pima Community College’s Veterinary Technician Program and continues to attend continued education classes to improve her skills. She enjoys spending time with her pets: Dakota, a Bichon Frise/Shih-Tzu mix; Niko, a Chihuahua/Terrier mix; and her two cats, Oreo and Cupcake. She also likes playing softball and spending time outside.

Angelica “Gel” Ross

Client Service Coordinator

Gel is a dedicated and patient advocate for every animal who comes to Goodheart Animal Health Center. She values the importance of keeping pets comfortable and secure by utilizing Fear Free practices. As a pet owner, she understands how overwhelming vet visits can be, so Gel sets up expectations before each appointment and takes time to answer any questions that clients may have. She also educates clients about the importance of preventive medication and lab work so that their pets live longer, healthier lives.

Gel attended the Vet Assistant Program at Pima College but continues her learning independently by watching videos and researching new medical practices. She loves all animals and appreciates the differences between breeds of dogs and cats.

In her free time, Gel loves to watch movies while doing diamond paintings or Sudoku puzzles. Her pets are Abby, a Rat Terrier/Bulldog mix; Peanut, a Pomeranian/Chihuahua mix; and two cats.

Isela Castro

Client Service Coordinator

As a pet owner, Isela understands the importance of proper communication and collaboration. Clients appreciate how she thoroughly explains the process of caring for their pets, her active listening skills, and how she strives to make sure clients feel heard and understood. Isela ensures that she addresses each question our client has and acquires as much information about a pet as possible, so she can get a complete understanding of each pet’s individual needs.

Isela loves to talk to people about pets and how to ensure that they live happy healthy lives. She practices communication skills outside of work because she enjoys making people feel valued and heard. She enjoys learning new things and works with her team to further her veterinary knowledge.

When not working, Isela enjoys spending time with friends and family, going hiking with Sally, her Poodle/Terrier mix, going to the gym, and exploring new areas. She loves all animals but has a special place in her heart for dogs and birds. She also has a pet Chinchilla named Boba.

Miranda Silva

Client Service Coordinator

Miranda’s approach to patient care is through empathy, education, and a positive attitude. She believes in collaborative communication so that clients can be involved with their pets’ treatment and care. She also enjoys teaching clients about the importance of preventative care and yearly lab work. Clients appreciate Miranda’s positive and helpful attitude and that she always has a smile on her face.

Originally, Miranda went to school for massage therapy; however, while in school, she began working at a dog daycare and realized she wanted to stay in the animal field. She brings her experience with dog behaviors and animal body language to Goodheart. To keep her skills current, she attends continued education events and reads articles about the developments in the veterinary field. When not working, she enjoys having adventures with her children, Nathaniel and Vylette, spending time with her friends and family, hiking, and diamond painting. She has two Chihuahuas – Nikko and Soncho, and a black cat named Shadow.