Meet Our Team

  • Dr.
    Russell Greene
    Medical Director

    Dr. Russell Greene is board certified in both Small Animal Internal Medicine and Bacteriology & Mycology. Dr. Greene is a 1983 graduate of the School of Veterinary Medicine at the University of California, Davis. He completed his small animal medicine & surgery internship at Texas A & M University, and completed his small animal internal medicine residency at North Carolina State University. While at NCSU, he obtained his PhD in Veterinary Microbiology. He then went on to do post-doctoral work in bacteriology, in Germany. In 1988, Dr. Greene became board certified in Small Animal Internal Medicine, and the following year he became board certified in Bacteriology & Mycology.

    Dr. Greene has taught at the College of Veterinary Medicine at North Carolina State University; has worked as an Internal Medicine Consultant at Southwest Veterinary Diagnostics; and has run two veterinary microbiology laboratories. He has spoken at both national and international veterinary conferences. In addition, he has authored numerous publications, including the chapter on Coccidioidomycosis (Valley Fever) in the text, Infectious Diseases of the Dog and Cat. Dr. Greene has been providing internal medicine consultations and special procedures (ultrasound, endoscopy, stent placement, and other interventional procedures) to Arizona veterinarians in the Greater Phoenix Metropolitan Area and the Prescott region since 1992—longer than any other small animal internist in the area.

  • Dr. Shery Babyak

    Dr. Shery Babyak is board certified in Small Animal Internal Medicine. She received both her Bachelor of Science (1988) and DVM (1992) degrees from Colorado State University. She then completed a rotating medicine and surgery internship at Oklahoma State University, and a small animal internal medicine residency at Louisiana State University. In 1997, Dr. Babyak became board certified in Small Animal Internal Medicine. Dr. Babyak began her Internal Medicine career in Las Vegas and practiced there for 5 years. In 2002, she moved to the Phoenix metropolitan area, where she worked locally as a staff internist for 18 years, prior to joining PVIMS.

  • Dr.
    Greta Heidner
    Hospital Director

    Dr. Greta Heidner serves as the Hospital Director. Here, she is holding Harry, one of our hard-working office cats. She and Dr. Greene are married, and they have one son. As a small specialty practice, with long-time employees, PVIMS is able to provide our referring veterinarians and clients with a level of responsiveness and personal service that may be lacking in a larger practice setting.

    Dr. Heidner is board certified in Oncology. She is a 1983 graduate of the School of Veterinary Medicine at the University of California, Davis. She completed her small animal medicine & surgery internship at the University of Illinois, Urbana, and completed her clinical fellowship in Oncology at North Carolina State University. In 1993, Dr. Heidner became board certified in Oncology. She has worked as a Clinical Instructor in Oncology at NCSU; at several small animal general practices; and at her own oncology specialty practice. Dr. Heidner brings her expertise to PVIMS.

Client Services Representatives

We have a friendly and experienced office staff to take your calls, set up appointments, and help with the medical reports. Quinn (on left), Heather (center left), Nicole (center right) and Antonia (on right) will go out of their way to help you in any way they can. All of our staff are animal lovers, who truly care about the pets we serve. Quinn is holding Hermione, one of our loyal office cats.

Veterinary Technicians

We are fortunate to have experienced and compassionate veterinary technicians. Adrian (on left) is our lead technician, and he assists Dr. Babyak with her procedures. Beth (coming soon) assists Dr. Greene with his procedures in the Greater Phoenix Metropolitan Area. Brianna (on right) assists Dr. Greene when he travels to the Prescott area to do procedures, one Saturday a month. Each PVIMS van houses a small office and carries the specialized ultrasound and endoscopy equipment that gets brought into the clinics of our referring veterinarians.

Technical Support

For every patient we see, a medical report is generated that is then faxed or emailed to the referring veterinarian, generally within 24 hours. Our medical records program was created especially for us by our talented computer programmer, John, to meet the unique needs of our practice. Not surprisingly, John is also a big animal lover.

Office Hours

Our Regular Schedule

Phoenix Veterinary Internal Medicine Services


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-6:00 pm


8:00 am-6:00 pm








  • "We can't express how thankful we are for your amazing care and service for our Charlie. You found and fixed his bleeding problem after years of issues. Thank you from the bottom of our hearts for giving outstanding care. You're a true blessing to the animal world."
    With sincere gratitude, Joe & Connie
  • "We really appreciated your time and the options you provided to us for Annie. It is difficult to put aside emotions and make the right decision for our four legged friends who depend on us and trust us. Having professionals like you available, helps a great deal in these difficult times. Never underestimate the difference you make, Dr. Greene. Thank you!"
  • "Thank you for all you have done and are still doing for Stella. We really appreciate it."
    Ronda M.
  • "I can’t thank Dr. Greene enough for what he has done for Buttons and Me."
    Lois S.
  • "Thank you for your help. Your kindness will not be forgotten!"
    Lori H.
  • "Very professional, I've known Dr. Greene for years! Very compassionate and knowledgeable in the care of your pet. This Dr. Greene goes above and beyond the call of duty for you and your pet’s well-being!"
    Lacy M.
  • "Dr. Greene understood the urgency that was needed for Gracie Mae, when others did not. Knowing you and your team were there to help was reassuring. Thank you!"
    Karen W.
  • "Your kindness and compassion has touched my heart deeply. It is because of people like you that make the world a better place. Please continue to share your light with the world!"
    Carla M.
  • "Dr. Greene’s expertise was invaluable and much appreciated. He put me at ease during an anxious time. I enjoyed discussing tennis with him, which, seemed fitting because BJ was named after a tennis player."
    Rose W.
  • "Thank you for helping with Eddie. Because of your expertise, he did not have to endure surgery. He has recovered well and I appreciate your kindness."
    Pat M.
  • "Thanks for saving Maxwell’s life! He means the world to our family. We appreciate the compassion, kindness, and prompt attention of your staff."
    Bill & Marilyn R.
  • "I am always thankful for those who help the most precious thing to me. Thank you for helping with LuLu."
    Carla M.
  • "Thank you for helping with Kismet. You have been so wonderful and kind to us and we are so thankful."
    John B. & Jonette S.
  • "Thank you for your help with Annie. I appreciate your compassion and generosity. I will never forget it!"
  • "Thank you for your professional excellence, personal care, rapid response, and overall generosity. There have been very few times I have found people that go the extra mile and that really care. I am very grateful that I was referred to you."
  • "Thank you for everything you did for our Barak. You went above and beyond what any vet would have done. You were a God-send to us in our time of need. We will always remember and cherish your kindness. Thanks for making a difference!"
    Warren & Deanna S.
  • "Thank you Dr. Greene for coming in the middle of the night for Maggie. She was a great companion."
    Heather C.