Stella has a longstanding history of service with the Alliance at the county, state, and national levels since 1955. She is a past president of the Ohio State Medical Association Alliance, a past president of the Montgomery County Medical Society Alliance in Dayton, Ohio, and a past president of the St. Johns County Medical Alliance in St. Augustine.
As a member of the American Medical Association Alliance (AMAA), Stella has held leadership positions and served on various committees over the years. As part of the American Medical Association’s Education and Research Foundation, she presented a Resolution to "Educate teenage athletes of the danger of smokeless tobacco", and a Resolution to “Educate parents to place their babies and small children in car seats with seat belts." She also served as a delegate to the AMAA from 1973 to 1994.
As a member of the Florida Medical Association Alliance, Stella has held positions to include Northeast Florida Director, By-Laws committee member, Long Range Planning committee member, Parliamentarian, chair of the Political Action Committee, and chair of the Legislative Council.
Locally, Stella served six times as president of St. Johns County Medical Alliance. She has chaired the Legislative and Scholarship committees, as well as served on the following committees: Fundraising, Doctors’ Day, and Holiday Share Card.