Dr. Adam

Zbigniew Piaseczny, DVM 

Cornell University

Dr. Adam obtained his veterinary education at Cornell University and Caldwell College with specialties in nutrition and diet, acupuncture, and herbal medicine. He is a “foodies’ vet”, keen on promoting awareness of the benefits of fresh food-based diets for pets. His style has been referred to as thorough, patient, and supportive. Dr. Adam always has animals in his family; his current main buddies are his hiking companion Ricky, a senior black Chihuahua mix, and J.J., a sweet and intense Border Collie adopted from Muttville. When Dr. Adam isn’t at Healthy Pets or lecturing, he enjoys spending time his sweet daughter, Sofia. Dr. Adam is fluent in Polish

Samantha Tong, DVM

UC Davis

Dr. Samantha earned her bachelors at Dartmouth College and veterinary degree from the University of California, Davis. After earning her veterinary degree, Dr. Samantha completed advanced training in a rotating internship at Veterinary Medical and Surgical Group, spent a year in Dallas, Texas as an emergency/general practitioner, and 3 years working as a general practitioner in New York City. Dr. Samantha is originally from Orange County, California where she grew up swimming, playing water polo, and surfing. She is happy to be back on the West Coast, where she can enjoy her time with her amazing husband, 2 kids, and her dog, a sassy Shih Tzu named Daisy.

Siobhan O'Connor, DVM

Tufts University

Dr. Siobhan O'Connor has known since a very early age that she wanted to become a veterinarian. She graduated from Tufts University School of Veterinary Medicine after attending undergraduate school at Cornell University. In 1996, she was board certified in canine and feline practice by the American Board of Veterinary Practitioners. She successfully re-certified in 2005 and 2015 and has a particular interest in geriatrics,  cardiology and endocrinology.

Immediately after graduating from vet school, Dr. O'Connor moved to San Francisco, fell in love with the Bay Area, and has lived and practiced here ever since. 

Now that her son Leo has gone off to college and beyond, she shares her home with her husband Jared and their two cats: Aengus the Korat and Hugo the Havana Brown. In her spare time she enjoys singing, hiking and traveling the world.

Michael Greener, DVM

University of Illinois

Dr. Michael Greener grew up on Long Island, NY, where he began volunteering at his local public animal shelter at the age of 12. From a young age, he knew he was destined to become a veterinarian. He earned his bachelor’s degree in Environmental Biology from the State University of New York College of Environmental Science and Forestry (SUNY-ESF) in Syracuse, NY.

He went on to attend the University of Illinois College of Veterinary Medicine in Urbana-Champaign. Here he decided after 4 years of living in the snowiest city (Syracuse) and 4 years living in the windiest state (Illinois) that he wanted to move to the west coast where the weather is beautiful all year round.
 

Since 2022, Dr. Greener has worked in the Bay Area as both a full-time general practitioner and a relief/locum veterinarian. He also took sometime in 2025 to focus on his interest in dermatology.
 

Dr. Greener strives to build strong, trusting relationships with his clients and patients while creating a calm, low-stress environment for every visit.
 

A lifelong animal lover, Dr. Greener has raised three dogs and, during veterinary school, adopted Boba—a one-eyed black cat—from a local shelter at the height of the COVID-19 pandemic. Outside of work, he enjoys hiking, traveling, and spending quiet evenings watching Netflix with his “one-eyed panther.”