Meet Our Team

Meet Our Veterinarians

  • Dan Bergerud
    DVM
    Dr. Dan joined Cass Veterinary Services in January 1997. His rural Iowa upbringing in Burt, Iowa and later in Iowa City, had a big influence on his chosen field. After high school, Dr. Dan completed his veterinary studies at Iowa State University. His original interest in veterinary medicine came about while working with dairy cows on the family farm. There are currently only a few dairy cows in the area and his favorite is a Jersey cow named Peaches.

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  • Josh Castaneda
    DVM
    After his graduation from the University of Illinois College of Veterinary Medicine in 2014, Dr. Josh joined Cass Veterinary Services. He is a member of American Veterinary Medicine Association, Illinois Veterinary Medicine Association, as well as an Alumni member of Omega Tau Sigma (OTS) veterinary fraternity. Dr. Castaneda still hosts students from OTS to help during rescue days, and help them practice their surgical skills. Having lived in Mexico for 18 years, Dr. Castaneda is ready to help our clients in either English or Spanish.

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  • Nicole Pfeiffer
    DVM

    Dr. Nikki is scheduling equine appointments for weekends. Please call our Virginia clinic to schedule.

    Dr. Pfeiffer grew up in the suburbs of Chicago. As a child, her family lived in South Korea for several years. After completing her undergraduate degree at Benedictine University, Nikki pursued her veterinary degree at the University of Illinois in Champaign. Following veterinary school, she completed an equine surgery and medicine internship at a large surgical center in New Jersey. She stayed on several years as an associate equine veterinarian, but knew she would eventually return to the Midwest. In February 2014, she moved to Springfield and joined an equine exclusive practice. After three years, the practice dissolved and Dr. Pfeiffer joined Cass Veterinary Service in May 2, 2015.


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  • R.L. Zeller
    DVM
    Dr. Zeller grew up on a farm near Alexander and always found the various animals fascinating, so becoming a veterinarian was a natural progression for him. He graduated from the University of Illinois School of Veterinary Medicine in 1974 and began working for Drs. McKinney and Roegge in what was then a mixed animal practice.

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Meet Our Staff

  • Jac
    Certified Veterinary Technician - Jacksonville Clinic

    A graduate of Hickey College Veterinary Technician Institute, Jacquelyn is originally from Golden, Illinois, and has spent her life in the central Illinois area. 

    Jacquelyn has been with Cass Veterinary Services for four years. Although she works in all vet tech areas, she enjoys any opportunity to work with equine. 

    Jacquelyn enjoys spending time with her dog, Tig, and two horses.

  • Anna
    Hospital & Clinic Manager – Virginia Clinic
    Born and raised in rural Illinois, Anna knew at a young age she wanted to work in the animal care field. She joined Cass Veterinary Services in 2004, but has worked in the profession since 1988 with experience in general, emergency and specialty medicine. Her favorite areas of treatment include radiology, lab work, and petting the patients.

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  • Tina
    Veterinary Technician | Bookkeeper
    Tina has been with Cass Veterinary Service for six years. Her love of all furry creatures began at an early age. She lives on a hobby farm with her husband and they have dogs, cats, horses, chickens, fainting goats and a miniature donkey. She has fostered many dogs and cats over the years, and volunteers her time at the local shelter advocating for homeless animals.

    Tina has a Bachelor’s degree in Biology with a minor in Chemistry.

  • Kris
    Inventory & Ordering Coordinator | Media & Marketing Coordinator

    Kris joined our team in May 2017 as a receptionist in our Virginia Clinic. Her more than 30 years of business administration experience, including bookkeeping, payroll, human resources and marketing, made her a natural to move into her current role in our inventory and ordering procedures and media and marketing efforts.


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  • Terrie
    Veterinary Technician – Jacksonville clinic
    A self-described lifelong animal lover, Terrie has worked with veterinarians for many years. Cass Veterinary Services gained Terrie’s vast experience when they acquired Dr. Zeller’s practice in May 2017. Terrie worked with Dr. Zeller for more than 37 years, combining her pleasure of working around animals with the necessity of feeding her own.

    Terrie is a lover of all animals, but has a special interest in Morgan horses, Australian Cattle Dogs, geese, ducks, and chickens.


  • Keri
    Receptionist – Virginia Clinic
    Keri was born and raised In Virginia, Illinois. With almost 20 years in customer service, she has been a great addition to the Cass Veterinary Services team since she joined in August of 2017.

    A lifelong lover of all animals, Keri’s compassion for our patients and family member clients is a great addition to our staff. When not at the clinic, Keri can often be found spending time with furbaby loves, dog Zoey, and cats Fiona and Cali.

  • Kris
    Groomer - Jacksonville Clinic
    Kris was born in California and lived in North Carolina before settling in the Midwest. She always thought she would be a veterinarian, but ended up taking another path. Her grooming work began when she spent ten years grooming 20 poodles her family raised. Kris was also a junior handler and showed in conformation and obedience.

    After obtaining a cosmetology license, Kris later realized she preferred grooming animals over people. It's easy to see that animals have always been a big part of her life, so when she saw a job listing that said, 'must love animals', she knew it was for her. That was more than 27 years ago when she started working at Dr. Zeller's office. Cass Veterinary Services is happy to have her join our team.

  • Madison
    Certified Veterinary Technician - Virginia Clinic
    Madison is a Beardstown High School graduate and recently received her associates degree in Veterinary Technology at The Vet Tech Institute at Hickey College.

    Madison started as a Kennel Assistant with Cass Veterinary Services in 2014 and has assisted in the clinic during college. Her favorite areas of treatment are dental services, surgery and appointment assists.

    Her fur family includes Inari, a Shiba Inu, Beans, a Corgi, and a cat named Thomas.


  • Lisa C.
    Kennel Assistant - Virginia Clinic
    Lisa has worked with our clinic for ten years. She started as a weekend Kennel Assistant in our Ashland clinic. In 2010, she moved to our Virginia clinic as a Kennel Assistant.

  • Stacy
    Receptionist - Jacksonville Clinic

    Stacy is a Jacksonville native and the mom of a 12 year old son and a 4 year old charcoal Labrador. She joined our practice after working several years in the pediatric field.

    ''I love animals and am excited about my move into the veterinary world.''

  • Abby
    Large Animal Technician - Virginia clinic

    Abby joined our staff in June as an intern. Her work ethic quickly moved her into a full-time position as a Tech. 

    The U of I graduate grew up on a farm outside of Jacksonville and is the mama to a Beau, an Aussie pup, a Malamute named Jarvis, and ''lots of cows''. 

  • Shaunna
    Receptionist & Veterinary Technician - Virginia Clinic

    Shaunna recently joined our clinic family in our Virginia clinic. Originally from Beardstown, she and her three teenagers have a sweet kitty named Cracker. 

    Of her responsibilities at the clinic, her favorite is walking recovered well pets to their humans to go home.

  • Ashley
    Certified Veterinary Technician - Jacksonville Clinic

    Born in Broken Arrow, OK, Ashley has spent the past 20 years ''bouncing all around colorful Colorado.'' She brings ten years of vet tech experience to our clinic, having worked in small and large animal clinics in Colorado.

    Ashley and her husband have a son and a daughter, and two dogs, Gruber, an American Bulldog, and Winnifred, a Brussels Griffon Corgi mix. In her free time, Ashley is an avid knitter and confesses she can often be found KIP (Knitting In Public).

    Patient care is Ashley's favorite part of her work. ''I enjoy being a surrogate owner and providing love and care.''


  • Joey
    Veterinary Technician - Jacksonville Clinic

    After several years working in the pet care retail industry, Joey joined our team as a vet tech in our Jacksonville clinic in the Fall of 2020. 

    A Jacksonville native, Joey's favorite part of working in our clinic is interacting with and caring for our patients.

    Joey shares his home with a basset/beagle mix named Soul, a dachshund/beagle mix named Cooper, two cats, Thor and Leeroy, and four tree frogs, Patchy, Ser, Cotton, and Beans.

*Walk-In hours at our Virginia location*

Monday - Friday: 1:00 pm to 2:00 pm, Saturday: 10:00 am to 11:00 am and 1:00 pm to 2:00 pm

Virginia Lobby hours - 217-452-7171

Monday - Friday: 8:00 am to 5:00 pm, Saturday: 8:00 am to 2:00 pm Scheduled appointments only outside of Walk-In hours.

Jacksonville Lobby hours - 217-243-3381

Monday - Friday 8:00 am to 5:30 pm, Saturday 8:00 am to 12:00 pm Scheduled appointments only, no walk-in clinic.

Ashland Lobby hours: - 217-476-8828

Monday & Wednesday: 8:00 am to 12:00 pm and 1:00 pm to 5:00 pm, Tuesday, Thursday & Friday: 8:00 am to 12:00 pm and 1:00 pm to 5:00 pm, Every Other Saturday: 8:00 am to 12:00 pm Scheduled appointments only, no walk-in clinic.

Office Hours by clinic

Virginia Lobby Hours:

Monday:

8:00 am-5:00 PM

Tuesday:

8:00 am-5:00 PM

Wednesday:

8:00 am-5:00 PM

Thursday:

8:00 am-5:00 PM

Friday:

8:00 am-5:00 PM

Saturday:

8:00 am-2:00 pm

Sunday:

Closed

Jacksonville Hours

Monday:

8:00 am-5:30 pm

Tuesday:

8:00 am-5:30 pm

Wednesday:

8:00 am-5:30 pm

Thursday:

8:00 am-5:30 pm

Friday:

8:00 am-5:00 pm

Saturday:

8:00 am-12:00 pm

Sunday:

Closed

Ashland Lobby Hours:

Monday:

8:00 am-12:00 pm

1:00 pm-5:00 pm

Tuesday:

8:00 am-12:00 pm

1:00 pm-4:00 pm

Wednesday:

8:00 am-12:00 pm

1:00 pm-5:00 pm

Thursday:

8:00 am-12:00 pm

1:00 pm-4:00 pm

Friday:

8:00 am-12:00 pm

1:00 pm-4:00 pm

Saturday:

8:00 am-12:00 pm

Sunday:

Closed

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