Dr. Hahn has never forgotten the advice he received from his Purdue University veterinary anatomy professor: dig deeply into each patient’s medical history and complete a thorough physical exam before coming to a diagnosis. This philosophy has guided his practice since day one.

Born and raised in West Chester, Pennsylvania, Dr. Hahn graduated from Henderson High School in the top 5% of his class before attending Bucknell University, where he earned his Bachelor of Science in Biology with a minor in Biochemistry, graduating Magna Cum Laude, Phi Beta Kappa. His introduction to veterinary medicine came from working at his family veterinarian’s practice during high school and college—a well-seasoned diagnostician who inspired Greg’s career path.

After graduating from Purdue University College of Veterinary Medicine, Dr. Hahn worked at a large six-doctor practice before returning to Chester County. In September 1992, he established Main Line Veterinary Hospital with invaluable assistance from his wife Elizabeth, a Registered Nurse who provided many insights from her human medical career.

While Dr. Hahn enjoys a rewarding general veterinary practice, he has cultivated particular expertise in internal medicine (especially endocrinology) and ophthalmology. He thrives on challenging cases, such as regulating diabetic dogs and cats, treating Cushing’s disease, and managing chronic skin and allergy conditions.

Dr. Hahn and Elizabeth have four daughters and many grandchildren living locally. In their leisure time, they love spending time on a beach—anywhere—though their schedule rarely allows it. The Hahns currently share their home with Eloise, a maltipoo rescue, and Addie, an extremely friendly Barbet whom many clients have met at the office.