About Our Veterinarians

In 1985, Drs. Brian Marder and Jonathan May established the Roslyn Veterinary Group. In 1993 they merged their successful practice with Greenvale Animal Hospital and the Roslyn Greenvale Veterinary Group was formed. Our hospital has been responsible for providing outstanding veterinary care in our current location ever since. Four to five years ago a major construction overhaul began, which transformed the inside of our clinic into a state of the art animal hospital. The final phase of construction is being completed this fall to complete the external transformation of our building.

We have grown over the years into a progressive practice with a great support staff to allow us to provide compassionate care for your pets. With over 65 years of combined veterinary clinical service and commitment to yearly continuing education events, our 4 full-time doctors are very knowledgeable and will deliver top notch veterinary care for your companion.

  • Brian Marder, DVM

    Dr. Marder received his B.S. in Animal Physiology from Cornell University in 1975, his M.A. in Reproductive Physiology from the University of Florida in 1976, and his Doctor of Veterinary Medicine degree from Cornell University in 1980. Dr. Marder is married with one son. He has 1 cat, 3 Yorkshire Terriers, 2 tortoises and several birds. When he is not working Dr. Marder enjoys almost all movies, tennis, and photography.

  • Jonathan E. May, DVM

    Dr. May received his B.S. in Biology from Cornell University in 1972, his M.S. in Molecular and Cell Biology from the University of San Francisco in 1974, and his Doctor of Veterinary Medicine degree from Cornell University in 1980. Dr. May has one daughter and one son. When Dr. May is not working he enjoys sports, music, and karate.

  • Allison H. Villa, DVM

    Dr. Villa received her B.S. in Animal Science from Cornell University in 1997, her A.A.S. in Veterinary Technology in 1999 from SUNY Canton and her Doctor of Veterinary Medicine degree from Ross University School of Veterinary Medicine in 2004. She completed her veterinary clinical training at North Carolina State University. Dr. Villa also completed an Internal Medicine, Surgery and Emergency & Critical Care Internship at Long Island Veterinary Specialists in 2005. She has 2 cats and 2 Yorkshire Terriers. When she is not working Dr. Villa enjoys photography, travel, reading, and playing with her dogs.

Please join us in congratulating Dr. Jonathan E. May as he was chosen as the 2008 Long Island Veterinarian of the Year by the Long Island Cat Fanciers Association!


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Office Hours

Our Regular Schedule

Greenvale Office


9:00 am-5:30 pm


9:00 am-5:30 pm


9:00 am-5:30 pm


9:00 am-5:30 pm


9:00 am-5:30 pm


9:00 am-3:00 pm


10:00 am-1:00 pm

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