About Us


Green Glen Equine Hospital Facilities

In 1968, Dr. Allen Wisner started Green Glen as a mixed animal practice on his 74-acre farm in Glen Rock, Pennsylvania.  A few years later he decided to devote his practice exclusively to horses.  Initially engaged in racetrack work, Dr. Wisner was the sole practitioner at Green Glen Equine Center for almost 20 years before hiring his first associate veterinarian, Dr. Mark McCubbin.  Dr. Wade Wisner took over the practice from his father in 2002.

Green Glen Equine Hospital has been performing surgery on our equine patients for over 50 years. Our newly renovated facility is equipped to handle the unique surgical needs of your horse with two new induction/recovery stalls and a state of the art surgery suite. 

Our building, though outfitted with the most current veterinary technology, remains one that is warm, inviting and retains its original farm charm. We are proud of our tradition and pledge to remain true to our small town family business values while implementing cutting edge veterinary medicine and technology for our clients.

Some of our more common procedures include arthroscopy, retained testicle removal and soft tissue surgery.  Other surgeries include resolution of foal related problems, such as umbilical hernias and treatment of limb deformities, as well as enucleations (and other eye surgeries), repair of complicated wounds, revision of old wounds, and mass removals.

We also offer hospitalization for intensive management of cases in our hospital stalls.  This allows us to more closely monitor your horse’s condition and provide superior medical therapy by adjusting treatments as needed. For those needing long term hospital management, we utilize our turnout paddocks and round pen.

Our Team of Doctors

Wade Wisner, VMD

Dr. Wisner received his undergraduate degree in Animal Science from the University of Delaware and went on to graduate from the University Of Pennsylvania School Of Veterinary Medicine in 1992.  During his time at New Bolton Center he spent extra time studying sports medicine.  After vet school he came to work for his father, Dr. Alan Wisner, VMD at Green Glen Equine Hospital. He took over the practice in 2002. He has developed a strong interest in sport horse medicine and surgery as well as lameness and acupuncture. 

Jennifer Hayes, DVM

Dr. Hayes attended the University of Findlay for her undergraduate education and pursued a dual major in Biology and Western Equestrian Studies.  She then attended The Ohio State University for veterinary school.  During her professional career, she has worked for equine veterinary practices in Pennsylvania and Ohio.  Dr. Hayes’ professional interests include chiropractic care, lameness, laminitis rehabilitation, dentistry, and reproduction.  She also places a strong emphasis on preventative medicine and a whole-horse approach to care for horses and their humans.

Chase Whitfield, DVM, MS, DACVS-LA
Board Certified Surgeon

Dr. Whitfield attended undergraduate and veterinary school at Oklahoma State University. Following veterinary school he completed a one-year rotating internship at Weatherford Equine Medical Center in Weatherford, TX. He then went on to complete a three-year Equine Surgery Residency at Oklahoma State University. He stayed on faculty at Oklahoma State University for one year as a large animal emergency clinician. Dr. Whitfield passed the rigorous surgery board examination in 2016 and became a board certified large animal surgeon. Before coming to Green Glen in 2019, he worked as a staff surgeon at Weatherford Equine Medical Center in Texas.

Heather Crather, DVM

Dr. Crather received her undergraduate degree in Equine Pre-Veterinary Science and Molecular Biology from Otterbein University in 2012.  She then went on to attend veterinary school at Virginia-Maryland College of Veterinary Medicine.  After graduation she began working in Pennsylvania with a practice that focused on general medicine and reproductive management. She also became chiropractic certified in 2019.  Dr. Crather’s professional interests include chiropractic care, overall athlete performance health and preventative medicine.  

Ethan Wilson, DVM

Dr. Ethan Wilson grew up on a small horse farm in northern Maryland where he learned to ride and participated in 4-H.  He received an undergraduate degree in Biology from McDaniel College before going on to attend Ross University School of Veterinary Medicine and undertaking his clinical year at the Virginia-Maryland College of Veterinary Medicine.  Following completion of his DVM in May of 2020, Dr. Wilson completed a rotating medical/surgical internship at Marion Dupont Scott Equine Medical Center in Leesburg, VA.  Dr. Wilson began his career at Green Glen Equine Hospital in the fall of 2021. In his free time he enjoys trying to teach his “coconut retriever” Gunner to come back with the frisbee.

Madison Edwards, DVM

Dr. Madison Edwards is from Annapolis, Maryland and she grew up riding and showing horses in the Hunter-Jumper discipline. In college, she studied Animal and Poultry Science at Virginia Tech. Following her undergraduate studies, Dr. Edwards stayed in Blacksburg, Virginia to earn her Doctorate of Veterinary Medicine at Virginia-Maryland College of Veterinary Medicine. Her areas of professional interest include sports medicine, repro, dentistry, and acupuncture. Dr. Edwards’ personal interests include riding her horses and hiking with her dog Herbie.

Green Glen Equine Hospital Team

The Team Behind the Scenes

They say ‘it takes a village’, and here at Green Glen Equine Hospital, our village of amazing staff members are here for you. Every member of our team plays an important role in the care of your horse. Without our team of talented and caring staff members, our veterinarians would not be able to sustain our top notch practice. Our technicians, interns, assistants and receptionists are dedicated to serving you-our clients, our patients and referring veterinarians.