Meet Our Doctors

  • Heidi G. Hoogeweg, DVM
    Medical Director

    A native of Chicago Heights, Dr. Heidi graduated from Marian Catholic High School, Loyola University of Chicago and in 1983 the University of Illinois College of Veterinary Medicine.  After practicing at a north suburban clinic for two years, she joined Markham Animal Clinic.  Her special interests include feline wellness and pet behavior.  She is passionate about reducing stress in our pets’ lives, including while coming to the vet, and is Fear Free Certified.  The joy that a healthy pet brings a client makes veterinary medicine so rewarding for Dr. Heidi.  She also enjoys bicycling, hiking and traveling with her husband Bill and their three sons. A border collie cross named Joey and a rat terrier cross named Allie share their home.

  • Denise L. Cudiamat, DVM
    Associate Veterinarian

    Dr. Denise graduated from Illinois Wesleyan University and in 2009 graduated from the University Of Illinois College of Veterinary Medicine.  She has served as Chief of Staff Veterinarian, Director of Development and Associate Veterinarian at small animal practices and is an experienced medical and surgical practitioner in wellness, intensive care and emergencies.   She is passionate about quality medicine and engaging her team, and has Fear Free Certification. She loves coaching her veterinary team to discover the best possible version of themselves while caring for pets and their families.  Dr, Denise is an active Christian, volunteering in her church and community as well as veterinary mission trips abroad with her husband and two young sons. They share their home with their cat Tom, and a  hound dog Dolly.

  • Jackie L. Hasson, DVM
    Associate Veterinarian

    Dr. Jackie is a Cornell University graduate, a  1996 graduate of the Virginia Maryland Regional College of Veterinary Medicine and brings years of experience in small animal medicine and surgery.  Her special interest is dentistry and oral surgery, having completed advanced training in dental local anesthesia, periodontal and oral surgery and extraction techniques.  Dr. Jackie is Fear Free Certified.  In her free time she enjoys traveling, hiking, biking, skiing and spending time with her husband and three children. They share their home with a Schnauzer named Dolly, an American Eskimo Dog Sotla, and two cats Hunter and Caspur.

  • Megan C. Gramhofer
    Associate Veterinarian

    Dr. Megan grew up in Northwest Indiana, graduating from St. Joseph’s College in 2016, and the University of Illinois College of Veterinary Medicine in 2020. She understands the bond we have with our loving animals and strives to provide the best medical care for your pet. Dr. Megan is Fear Free Certified and is passionate about minimizing stress whenever possible for your pet. Her special interests include preventative medicine, ophthalmology, and exotic animal medicine. As an active Christian, she’s been on four veterinary mission trips to Nicaragua. Dr. Megan has a beagle named Alice, a snake named Ciara, and two cats named Harrison and Walter. In her free time she enjoys walks with her dog, biking, traveling, knitting, and reading.

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Office Hours

Our Temporary Schedule

Markham Animal Clinic


8:00 am-7:00 pm


9:00 am-5:00 pm


8:00 am-7:00 pm


9:00 am-5:00 pm


9:00 am-5:00 pm


8:00 am-1:00 pm