A Note From Dr. John Nista
I have tremendous passion for our profession and the patients we serve. I feel privileged to be part of a profession that makes such a profound difference in people’s lives. My staff is vitally involved in this process and helps support our patients at every step of their journey. Straightening teeth is part of what we do but the entire GNO team strives very hard to help people enrich their overall lives.
We view our practice like one big happy family. We reach out to help each other and our patients in any way possible. We cherish the friendships we develop and constantly strive to encourage our patients to be the best that they can be. Our office is a warm, nurturing, fun place to be. There is no other profession we would rather be in. We love what we do! That’s what you can expect from GNO.
Family & Community
Dr. Nista’s personal interests include golf, fishing, skiing and cooking. He is an active member of the Knights of Columbus and is currently participating in Creative Mentoring. He, too, is a past President of the Delaware State Dental Society. Dr. Nista is married with two children, Jason and Sarah. Being the oldest of five children, he particularly enjoys working with young children.
Dr. Nista attended dental school at the University of Pittsburgh, completed a General Practice Residency at the Veterans Administration in Dayton, Ohio and completed his orthodontic training at Albert Einstein Medical Center in Philadelphia. He has had extensive training in surgical jaw procedures. Dr. Nista joined Dr. Greeley in 1990 and a special relationship was born!
Dr. Leah Yi
Family & Community
Dr. Leah comes from a family of dentists who all reside locally in Delaware. She grew up mostly in Korea but has also lived in Virginia, Texas, California and Pennsylvania. She has one daughter Emelia. Whether its playing tennis, biking, or a spring-cleaning, Dr Leah likes to stay active in her free time. She also loves to read for pleasure and to stay up to date with the ever evolving field of orthodontics.
Dr. Leah received her dental degree, masters, and completed her orthodontics residency at the University of Pennsylvania. She moonlighted as a general dentist during her orthodontics residency to serve the dental needs of the local community. Her experience as a dentist and involvement at her local Spear education study club inspired an approach that is comprehensive and focused on maintaining overall oral health in addition to perfect dental alignment. She has published articles on a 3D study of craniofacial growth and has integrated 3D imaging into the office to enhance the treatment planning process for her patients. She received her board certification with the American Board of Orthodontics in 2020 and is a member of the American Association of Orthodontics. From her experience working with top Invisalign providers and continuing education, she is adept with Invisalign in addition to traditional fixed appliances.