Green Glen Equine Hospital


Green Glen Equine Hospital is staffed with a talented and diverse group of equine veterinarians.

Wade A. Wisner, V.M.D.

Dr. Wade Wisner received his undergraduate degree from the University of Delaware. Dr. Wisner graduated from the University of Pennsylvania School of Veterinary Medicine in 1992 and came to work for his father at Green Glen Equine Hospital.

He took over the hospital in 2002 when his father, Dr. Allen Wisner, retired. His primary interest is lameness in the sport and performance horse.

You can email Dr. Wisner directly at

Mark E. McCubbin, D.V.M.

Dr. Mark McCubbin received his BS from Pennsylvania State University in 1973. After graduating he continued his veterinary studies at the University of Georgia College of Veterinary Medicine and graduated Magna Cum Laude in 1977.

Dr. McCubbin joined Dr. Allen Wisner at Green Glen Equine Hospital in 1982.

You can email Dr. McCubbin directly at

Jennifer Karl, D.V.M.

Dr. Jennifer Karl grew up with horses in Northern Ohio.  She was very active in 4-H and competed at the national level in horse judging, horse bowl, and hippology contests.  Dr. Karl also devoted a lot of time to showing and competition with her horses.  She attended the University of Findlay for her undergraduate education and pursued a dual major in Biology and Western Equestrian Studies.  Dr. Karl 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. Karl’s professional interests include lameness, laminitis rehabilitation, dentistry, and reproduction.  She also places a strong emphasis on preventative medicine and a whole-horse approach to care to help horses and their humans.  In her free time, Dr. Karl enjoys trail riding with her fiancé, Greg, and spending time with her own horses and dog. 

You can reach Dr. Karl at

Dr. Allen B. Wisner, V.M.D.

Dr. Allen Wisner graduated from the University of Pennsylvania School of Veterinary Medicine in 1965. He started Green Glen as a mixed animal practice but three years later, decided to devote his practice exclusively to horses. Initially engaged in track work, Dr. Wisner was the sole practitioner at Green Glen Equine Hospital for almost 20 years. In 2002, one of Dr. Wisner's young patients became a local celebrity and earned him national and international attention when the thoroughbred 'Magic Weisner' (a misspelling of Dr. Wisner's name) lost the Preakness Stakes by 3/4 length to War Emblem and placed a respectable fourth in the Belmont Stakes.

Dr. Wisner turned over his practice in 2002 to his son, Dr. Wade Wisner.

  Sue Wood has been working at the hospital for over 20 years.  Some of her responsibilities are scheduling appointments, billing, and assisting in surgery. She enjoys doing pet therapy and agility with her dog Bailey.    Jess Cammauf is a certified veterinary technician who graduated from Wilson College. She joined our practice after graduating in 2004. Some of her responsibilities include assisting in surgery and monitoring anesthesia. Jess enjoys spending time with her dogs and horses.
Heather Supanick graduated from Slippery Rock University. She has been working at the hospital since 2006. You will see her in the hospital and out in the field assisting the veterinarians. She enjoys spending her free time hiking with her dogs and riding her horse.   Jen Dempsey graduated with a degree in Equine Science from Centenary College in 2010. She started working at the hospital in 2011. Some of her responsibilities are scheduling appointments and assisting the veterinarians in the field. In her free time she enjoys barrel racing, team sorting, trail riding and spending time with her fiancé and dog.

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