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Dr. Marc Siebert is the owner and medical director of Heart of Chelsea Veterinary Group. A native of New Jersey, Dr. Siebert opened Heart Of Chelsea Veterinary Group as a one-doctor practice in 1999; it has since grown to a five-doctor practice supporting Chelsea and its pet community at large. He attended Rutgers University and received a bachelor’s degree in environmental science in 1987. He continued his education at the University of Pennsylvania College of Veterinary Medicine and was awarded his Doctorate of Veterinary Medicine in 1993. Dr. Siebert is also a certified veterinary acupuncturist with the International Veterinary Acupuncture Society; in addition, he is a U.S. Department of Agriculture-accredited veterinarian.

Dr. McNulty lives in Brooklyn with his husband, Sean and their dog, Leo. When not working, Dr. McNulty enjoys traveling, spending time with his sixteen nieces and nephews, exploring New York City’s food and culture scene, and the occasional night of karaoke.

Born and raised in Owensboro, Kentucky, Dr. Chase McNulty knew from a young age that he would work with animals when he grew up. In kindergarten, his dream was to be a zookeeper, and by third grade, he had narrowed his professional options to either veterinarian or professional wrestler. Thankfully his love for animals won out, and he worked at several veterinary clinics from middle school through college. After studying biology and animal science at Western Kentucky University, Dr. McNulty obtained his Doctor of Veterinary Medicine and Master of Science degrees from the University of Wisconsin-Madison, and he is currently pursuing a Master of Public Health from Johns Hopkins University. In veterinary school, he loved his courses on companion animals, and he also developed a passion for public and global health. His research projects have included studying infectious respiratory diseases in African buffalo in South Africa, food-borne diseases in Ecuadorian dairy cows, and herd health and reproduction in Nicaraguan cattle. Today, Dr. McNulty brings a One Health approach to veterinary medicine by tending to his patients’ needs, fostering the human-animal bond, and being mindful of the close connections between human, animal, and environmental health.