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Donald MacKinnon is the founder of Hingham-based Atlantic Development, a real-estate development company whose completed projects throughout New England are valued at more than a half-billion dollars and have led to the creation of thousands of jobs and millions of dollars in new real estate tax revenue for their host communities.

He has been a member of the Executive Board of the South Shore YMCA for more than 20 years and also currently serves as a member of the Board of Trustees of Thayer Academy.