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About our Veterinarians

Jared Coren, Veterinarian

Dr. Jared Coren

Education: Cornell University

Dr. Jared Coren is proud to be a part of the West Hills team. Being the son of Dr. Alan Coren, he grew up going to work with his dad and has filled a variety of roles at West Hills Animal Hospital over the years. He obtained his Bachelor of Science Degree from Cornell University, where he graduated Summa Cum Laude. He then pursued his Doctorate of Veterinary Medicine from Cornell University, graduating in the Top 10% of his class. Dr. Jared was inducted into the Phi Zeta Honor Society as a third year veterinary student, an honor reserved for the top ranked members in the class. While in veterinary school, Dr. Jared was a two-time award winner of the Finger Lakes Kennel Club Award, an award given to a student that displayed a strong interest in purebred dogs. He was also awarded the AKC Veterinary Outreach Award for his dedication to the health and well-being of companion animals. As a 4th year veterinary student Dr. Jared received The Neuroanatomy and Clinical Neurology Award for his outstanding expertise and interest in Neurology.

After veterinary school, Dr. Jared pursued an internship in medicine and surgery at the prestigious Animal Medical Center in New York City. Dr. Jared has a strong interest in Ophthalmology, Internal Medicine (especially endocrine disorders), and Reproduction. Over the years he has become very active and familiar with the Bulldog breed and currently works with a number of breeders to perform progesterone levels to time ovulation, C-Sections, and help keep their lines healthy. He is a member of the American Veterinary Medical Association, New York Veterinary Medical Society, the Long Island Veterinary Medical Association, and the American Animal Hospital Association. Dr. Jared has been nominated for Best Veterinarian on Long Island from 2014-2017. He currently lives in New York City with his wife, Jessica, and Rhodesian Ridgeback, Kobe.

Mario Costa, Veterinarian

Dr. Mario Costa

Education: Western University of Health Sciences

Dr. Mario Costa was born and raised in Queens, NY. He received a Bachelor of Science degree from Binghamton University in 2013. Following graduation, Dr. Costa moved out to California to attend veterinary school at Western University of Health Sciences where he received a Doctorate of Veterinary Medicine degree in 2017. His professional interests include surgery, emergency medicine and community practice. Outside of work, Dr. Costa enjoys playing the piano, hiking, reading, and cuddling with his dog, Shayna.

Jessica DeAcetis, Veterinarian

Dr. Jessica DeAcetis

Education: Western University of Health Sciences

Dr. Jessica DeAcetis grew up in Cold Spring Harbor, NY. Her first dog as a child, a West Highland White Terrier, was in fact a patient of West Hills Animal Hospital many years ago. She earned her undergraduate education at Boston University and her veterinary education at Western University of Health Sciences in Pomona, CA. After graduating, she completed a one-year general medicine and surgery internship, followed by a one-year small animal surgery internship at Long Island Veterinary Specialists in Plainview, NY. Since then, she has worked in both emergency medicine and in general practice. She is also a graduate of the Chi Institute Small Animal Acupuncture program.

Dr. DeAcetis currently shares her home with a black domestic shorthair cat named Chloe and a rescue pit mix named Mildred!

Elizabeth Goodland, Veterinarian

Dr. Elizabeth Goodland

Education: Tufts University

Dr. Beth Goodland was born and raised on Long Island. She received her Bachelor’s degree from the University of Delaware with a double major in Animal Biosciences and Agriculture. During this time, she also spent time working with a number of local organizations on Long Island with animals of all shapes and sizes. Dr. Goodland then attended Tufts University’s Cummings School of Veterinary Medicine where she completed a doctorate degree in veterinary medicine. She pursued further training by completing a one-year small animal internship at Red Bank Veterinary Hospital in New Jersey. Dr. Goodland shares her home with 3 cats, 1 dog and 1 rabbit. Her professional interests include emergency medicine and exotic companion mammal medicine. In her free time she enjoys indoor rock climbing, hiking and spending time with her family.

Katie Parsley, Veterinarian

Dr. Katie Parsley

Education: Ross University, Oklahoma State University

Dr. Katie Parsley grew up in Deer Park, NY surrounded by pets. She has always known she was going to be a veterinarian—and began to work in animal hospitals when she was just 15 years old.

She graduated from Villanova University in 2004 with a BA in Art History, as well as concentrations in Comprehensive Science and Studio Art. After college and for the next 7 years, she worked in animal hospitals in many capacities such as assistant, receptionist, groomer, and tech. She then decided to complete her doctorate of veterinary medicine at Ross University, on the island of St. Kitts. Finishing her clinical year at Oklahoma State University, she returned to Long Island to practice small animal medicine. Since graduating in 2015, she has steadily worked in general practice and is excited to join our team at West Hills. Her professional interests include internal medicine, surgery, and ophthalmology.

Dr. Parsley currently resides in East Islip with her rescued pets – 7 cats, a dog named Lizzie, and a chinchilla. When not at work she enjoys gardening, traveling, and spending time with family.

Stacey Ries, Veterinarian

Dr. Stacey Ries

Education: Cornell University

Dr. Stacey A. Ries is a graduate of Cornell University, where she earned a Bachelor of Science Degree in Animal Science in 1991 and her Doctorate of Veterinary Medicine in 1995. Dr. Ries grew up in the Adirondacks but has been practicing on Long Island since 1998. While the focus of Dr. Ries’ career has been providing exceptional client and patient care in General Small Animal Practice, she has also worked in Emergency/ Critical Care settings and spent two very rewarding years in Shelter Medicine as a staff veterinarian at The Michigan Humane Society in Detroit.

When not at work, Dr. Ries enjoys gardening, alpine mountaineering, ice climbing, Obstacle Course Racing and spending time with her family. She currently “shares her home with” (code phrase for “lives to serve”) five guinea pigs, a former junkyard cat named Opie and an intolerably spoiled Beagle Mutt named Thelma.

Jason Siegelheim, Veterinarian

Dr. Jason Siegelheim

Education: University of Florida

Dr. Jason Siegelheim grew up in Dix Hills, New York. He attended Cornell University, where he earned a BS in Animal Science in 2008. He went on to study at the University of Florida College of Veterinary Medicine in Gainesville, where he gained experience in both small and exotic animal medicine, graduating in 2012.

Dr. Siegelheim went on to spend four and a half years working at Central Animal Hospital in Scarsdale, New York. There, he cared for dogs, cats, rabbits and exotic pets, including birds, reptiles and all types of small mammals. He also worked with wildlife brought in by the Greenburgh Nature Center staff, local wildlife rehabilitators and the Greenburgh Police. Since November 2014, Dr. Siegelheim has also provided veterinary services at the City of Yonkers Animal Shelter, where he performs spays, neuters and other surgeries on adopted dogs and cats.

Dr. Siegelheim’s professional interests include dentistry, dermatology, neurology, and small/exotic animal medicine and surgery. At home, he cares for his dog, Jee, a New Guinea Sideneck Turtle and a flying squirrel named Icarus. He currently resides in North Riverdale and enjoys hiking with Jee, rock climbing, traveling and watching movies.

Tiffany Sikalas, Veterinarian

Dr. Tiffany Sikalas

Education: University of Pennsylvania

A native of Long Island, Dr. Tiffany Sikalas earned her Bachelor’s degree in History with a minor in Chemistry from Hunter College in 2008. After college, she went on to earn her VMD degree from the University of Pennsylvania in Philadelphia, PA. She then completed a rotating small animal medicine and surgery internship at the ASPCA Animal Hospital in New York, NY. After spending some time practicing emergency medicine in Connecticut Dr. Sikalas was eager to return home, and happily joined our team at West Hills Animal Hospital. She currently lives in East Setauket with her husband Nick and their four dogs, Hugo, Weeble, Peter Griffin, and Madam Kerfluffle.

Rebecca Warns, Veterinarian

Dr. Rebecca Warns

Education: University of Pennsylvania

Dr. Becca Warns grew up in Charlottesville, VA. She graduated from Boston College with a Bachelor of Science in Biology. She later moved to Philadelphia to attend veterinary school at the University of Pennsylvania. Afterwards, she completed a small animal medicine, surgery, and emergency internship in Brooklyn. Her professional interests include internal medicine and cardiology. Dr. Warns lives in Queens with her husband (Tom), their two cats (Wilma and Brooklyn), a corn snake (Slinky), and dozens of fish. In her free time she loves running, reading, spending time with family and friends, and exploring New York.

Kristie Williams, Veterinarian

Dr. Kristie Williams

Education: Ross University, Tufts University

Dr. Kristie Williams is a native to Long Island having grown up in Syosset/Woodbury, and joined the team at West Hills after two years of internships directly following veterinary school. Prior to vet school, she worked as a veterinary technician/assistant for many years at several small animal hospitals on Long Island. Dr. Williams graduated from Penn State University in 2012 with a Bachelors in Animal Sciences. She then attended Ross University School of Veterinary Medicine with a final year of clinical training completed at Tufts School of Veterinary Medicine, graduating with high honors in 2016. After graduation she completed a rotating internship in small animal medicine and surgery at the esteemed Animal Medical Center in NYC and proceeded to complete a specialty internship in small animal surgery at BluePearl Veterinary Partners in NYC thereafter. Her professional interests include surgery, wellness care, diagnostic imaging, and internal medicine. Dr. Williams currently resides in Muttontown with her fiancé Steve, pitbull Cash, shepherd mix Colby, and two Pekin ducks Mac & Cheese.

Veterinary Housecall in Long Island NY

24hr Emergency & Critical Care Center

Housecalls for 3 or more pets pay the exam fee only (no additional housecall fee)! And clients of Housecall Veterinary Service never pay any additional after-hours emergency fees at West Hills Animal Hospital & Emergency Center!

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