Meet Our Team

Our Veterinary Hospital Staff

  • Evie Fredenburg
    Practice Manager

    Evie has worked for Greenfield Animal Hospital since Jan 2001. She spent two years at Central Michigan working towards a degree in anthropology. She has 3 cats. Outside of work, Evie enjoys playing the bass. When asked what she liked most about working for Greenfield Animal Hospital, she answered, 'The compassion exhibited to all animals by the entire staff. It makes me proud to be employed here.' You can reach Evie at

  • Tracy Mattis

    Tracy Mattis has been employed at Greenfield Animal Hospital since 1993. She received her degree in Veterinary Technology from Wayne State University in 1996. Tracy is very passionate about small animal anesthesia and surgery. She has two teenage daughters, 2 dogs, 6 cats (including one born with no eyes), a frog named Nelly, and a horse! She enjoys riding and jumping horses in her spare time.

  • Joslyn Mazzetti

    Joslyn took her LVT boards in the summer of 2012 to become a licensed technician although she has worked for Greenfield Animal Hospital since she was 16 years old! She has 3 crazy kitties, two dogs and a bird that she cares for. In her spare time, Joslyn enjoys horseback riding, swimming, and playing softball.

  • Tracy Lantto

    Tracy is a licensed veterinary technician and has been with Greenfield Animal Hospital since 2012. Tracy received her degree in Veterinary Technology from Wayne State University in 2012. She loves being active and adores her 5 dogs and 5 cats!

  • Chelsea Hawley

    Chelsea has been working with dogs and cats since she was 14 years old. She graduated in 2015 from Baker College. She has 3 pitbull mixes and 2 cats. During her spare time she loves to take her dogs to the dog park

  • Mary Isaac

    Mary graduated from Michigan State University in 2013. She began her vet tech career in research, working for both MSU and WSU on new treatments for human and animal diseases. Mary also has emergency and critical care experience, though she prefers general practice as she is able to get to know her patients. Mary does not have spare time, but if she did, she would enjoy dance, sewing, and boxing. She has three cats, Willie, Gimli, and Walter, and fantasizes about one day owning a dog.

Our Front Desk Staff

Our Technician Assistants

  • Emily Hirt

    Emily has worked for Greenfield Animal Hospital since 2013 as one of our kennel attendant members. Emily has a beautiful little dog named Lyla and fosters animals looking for homes. Wildlife rehab is her passion and she hopes to work in that field in the future.

Our Grooming Staff

  • Liz Van Wye

    Liz was a Veterinary Technician for 25 years before starting her grooming career. She has now been grooming for over 20 years. She is a gentle and compassionate groomer and has a knack for working with frightened dogs often times preventing the need for sedation before grooming. She has been a part of the Greenfield since 2015.

Contact Us Today

We look forward to hearing from you


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Office Hours

Our Regular Schedule

Greenfield Animal Hospital


8:00 am-8:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-8:00 pm


8:00 am-5:00 pm


8:00 am-4:00 pm



For after hours emergency care call

Oakland Veterinary Referral Services at (248) 334-6877