Our veterinarians
Dr. Gregory Hahn
Practice Owner, Veterinarian
Dr. Hahn has never forgotten the advice he received from his Purdue University Veterinary anatomy professor. As he recalls it, the professor urged his students to dig deeply into each patient’s medical history and complete a thorough physical exam, before coming to a diagnosis.
Greg was born and raised in West Chester, Pennsylvania, where he often visited his grandfather, who managed a 350-acre estate for an absentee owner. Young Greg gained exposure to unusual wildlife such as large snapping turtles, pheasants, ducks, and various snakes. Graduating from Henderson High School in the top 5 percent of his class, Greg wanted a rural college setting, so he chose Bucknell University in Lewisburg, Pennsylvania. Greg graduated Magna Cum Laude, Phi Beta Kappa with a Bachelor of Science in Biology and a Minor in Biochemistry. Greg received his introduction to veterinary medicine by working at his family veterinarian’s practice during high school and college. In fact, this well-seasoned veterinarian, who was an excellent diagnostician, served as the inspiration for Greg’s veterinary medicine career.
Greg was excited to be accepted into the Purdue University College of Veterinary Medicine.After graduation from veterinary school, Dr. Hahn worked at a large six-doctor practice before moving back to Chester County. In September 1992, Dr. Hahn established Main Line Veterinary Clinic with valuable assistance and partnership from his wife Elizabeth. A Registered Nurse, she provided many insights gained from her human medical career.
While Dr. Hahn enjoys a rewarding general veterinary practice, he also cultivates his interest in internal medicine, especially endocrinology, as well as ophthalmology. Dr. Hahn thrives on challenging cases; for example, he enjoys the difficult task of regulating diabetic dogs and cats and treating Cushing's disease in dogs. Dr. Hahn also likes to manage chronic skin/allergy conditions.
Dr. Hahn leads a full life away from the hospital. He and Elizabeth have four daughters and many grandchildren that live locally. In their leisure time, Dr. Hahn and Elizabeth love to spend time on a beach – anywhere – but their schedule rarely allows this. Finally, Dr. Hahn has always been surrounded by sweet, loving dogs. His family has been very fortunate to live with several great dogs: Champagne, a Golden Retriever, and Clementine, a very smart Australian Shepherd whose memory will live in their hearts forever.
Currently, Dr. Hahn and his wife share their home with Eloise, a maltipoo rescue and Addie, an extremely friendly Barbet whom many of you have met at the office.
Practice Owner, Veterinarian
Dr. Hahn has never forgotten the advice he received from his Purdue University Veterinary anatomy professor. As he recalls it, the professor urged his students to dig deeply into each patient’s medical history and complete a thorough physical exam, before coming to a diagnosis.
Greg was born and raised in West Chester, Pennsylvania, where he often visited his grandfather, who managed a 350-acre estate for an absentee owner. Young Greg gained exposure to unusual wildlife such as large snapping turtles, pheasants, ducks, and various snakes. Graduating from Henderson High School in the top 5 percent of his class, Greg wanted a rural college setting, so he chose Bucknell University in Lewisburg, Pennsylvania. Greg graduated Magna Cum Laude, Phi Beta Kappa with a Bachelor of Science in Biology and a Minor in Biochemistry. Greg received his introduction to veterinary medicine by working at his family veterinarian’s practice during high school and college. In fact, this well-seasoned veterinarian, who was an excellent diagnostician, served as the inspiration for Greg’s veterinary medicine career.
Greg was excited to be accepted into the Purdue University College of Veterinary Medicine.After graduation from veterinary school, Dr. Hahn worked at a large six-doctor practice before moving back to Chester County. In September 1992, Dr. Hahn established Main Line Veterinary Clinic with valuable assistance and partnership from his wife Elizabeth. A Registered Nurse, she provided many insights gained from her human medical career.
While Dr. Hahn enjoys a rewarding general veterinary practice, he also cultivates his interest in internal medicine, especially endocrinology, as well as ophthalmology. Dr. Hahn thrives on challenging cases; for example, he enjoys the difficult task of regulating diabetic dogs and cats and treating Cushing's disease in dogs. Dr. Hahn also likes to manage chronic skin/allergy conditions.
Dr. Hahn leads a full life away from the hospital. He and Elizabeth have four daughters and many grandchildren that live locally. In their leisure time, Dr. Hahn and Elizabeth love to spend time on a beach – anywhere – but their schedule rarely allows this. Finally, Dr. Hahn has always been surrounded by sweet, loving dogs. His family has been very fortunate to live with several great dogs: Champagne, a Golden Retriever, and Clementine, a very smart Australian Shepherd whose memory will live in their hearts forever.
Currently, Dr. Hahn and his wife share their home with Eloise, a maltipoo rescue and Addie, an extremely friendly Barbet whom many of you have met at the office.
Dr. Marcie Ho-Gatto
Associate Veterinarian
Dr. Marcie joined Main Line Veterinary Hospital in 2017.
Dr. Marcie grew up in Hawaii and attended the University of Hawaii where she received her undergraduate degree in Animal Science. She obtained her veterinary degree at the University of Missouri-Columbia Veterinary School. Upon graduation, she traveled to several states working as a general veterinary practitioner then as a regional medical director for a veterinary corporation.
Her passion was working with clients and their “kids”, so she transitioned back into practice and eventually settled in Pennsylvania. Dr. Marcie has a strong interest in alternative medicine and received her certification in veterinary medical acupuncture.
Dr. Marcie spends her free time with her husband, Nick and 2 children, Malia and Michael, traveling and visiting family in Hawaii. She also spends her time selling her pottery at craft fairs and playing in the garden with her dog, Lulu. She is excited to become part of the Main Line Veterinary Hospital family and looks forward to meeting everyone!
Associate Veterinarian
Dr. Marcie joined Main Line Veterinary Hospital in 2017.
Dr. Marcie grew up in Hawaii and attended the University of Hawaii where she received her undergraduate degree in Animal Science. She obtained her veterinary degree at the University of Missouri-Columbia Veterinary School. Upon graduation, she traveled to several states working as a general veterinary practitioner then as a regional medical director for a veterinary corporation.
Her passion was working with clients and their “kids”, so she transitioned back into practice and eventually settled in Pennsylvania. Dr. Marcie has a strong interest in alternative medicine and received her certification in veterinary medical acupuncture.
Dr. Marcie spends her free time with her husband, Nick and 2 children, Malia and Michael, traveling and visiting family in Hawaii. She also spends her time selling her pottery at craft fairs and playing in the garden with her dog, Lulu. She is excited to become part of the Main Line Veterinary Hospital family and looks forward to meeting everyone!
Dr. Lauren Trusa
Associate Veterinarian
Born and raised near Scranton, Pennsylvania, Dr. Trusa knew she wanted to be a Veterinarian since she was 6 years old. She attended Chestnut Hill College in Philadelphia for her undergraduate studies, graduating cum laude with a Bachelor of Science Degree in Biology and Environmental Sciences. In 2009, her lifelong passion became a reality when she was accepted into the Veterinary Medicine program at the prestigious Royal Veterinary College in London, England. Dr. Trusa completed 5 rigorous years of training before successfully obtaining a Bachelor of Veterinary Medicine (BVetMed) degree - an advanced doctoral degree awarded specifically to graduates of the RVC.
After completing her studies, Dr. Trusa remained in England for 10 years. It is there where she honed her skills as a general veterinary practitioner. Dr. Trusa served as lead surgeon within her team, and was eventually promoted to the role of Senior Veterinarian. Dr. Trusa loved her time in England - running a busy practice, devotedly serving her community, and caring for pets across South Yorkshire. In her heart, Dr. Trusa always knew she would return home to Pennsylvania one day. In 2024, she emigrated back to the US along with her husband Rich and their calico cat Poppy, starting their next chapter in Chester County. Dr. Trusa has special interests in soft tissue surgery, dentistry, and the application of alternative therapies for pain management. Dr. Trusa is also Fear Free Certified and a Feline Friendly practitioner.
Dr. Trusa loves to spend her free time relaxing with a good book and a G&T, traveling around the world with her husband, or cooking for her friends and family. She is also a fan of the performing arts and has been known to dabble in amateur dramatics. Dr. Trusa is so happy to be joining the team at Main Line Veterinary Hospital and can’t wait to meet all of the wonderful clients and their furry friends!
Associate Veterinarian
Born and raised near Scranton, Pennsylvania, Dr. Trusa knew she wanted to be a Veterinarian since she was 6 years old. She attended Chestnut Hill College in Philadelphia for her undergraduate studies, graduating cum laude with a Bachelor of Science Degree in Biology and Environmental Sciences. In 2009, her lifelong passion became a reality when she was accepted into the Veterinary Medicine program at the prestigious Royal Veterinary College in London, England. Dr. Trusa completed 5 rigorous years of training before successfully obtaining a Bachelor of Veterinary Medicine (BVetMed) degree - an advanced doctoral degree awarded specifically to graduates of the RVC.
After completing her studies, Dr. Trusa remained in England for 10 years. It is there where she honed her skills as a general veterinary practitioner. Dr. Trusa served as lead surgeon within her team, and was eventually promoted to the role of Senior Veterinarian. Dr. Trusa loved her time in England - running a busy practice, devotedly serving her community, and caring for pets across South Yorkshire. In her heart, Dr. Trusa always knew she would return home to Pennsylvania one day. In 2024, she emigrated back to the US along with her husband Rich and their calico cat Poppy, starting their next chapter in Chester County. Dr. Trusa has special interests in soft tissue surgery, dentistry, and the application of alternative therapies for pain management. Dr. Trusa is also Fear Free Certified and a Feline Friendly practitioner.
Dr. Trusa loves to spend her free time relaxing with a good book and a G&T, traveling around the world with her husband, or cooking for her friends and family. She is also a fan of the performing arts and has been known to dabble in amateur dramatics. Dr. Trusa is so happy to be joining the team at Main Line Veterinary Hospital and can’t wait to meet all of the wonderful clients and their furry friends!