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Founding is the act of starting something new. The founding of The Oprah Winfrey Leadership Academy, a boarding school for girls in South Africa, was possible because of Oprah's massive donation of money toward the cause.
A founder is someone responsible for founding or getting something started. In American history, the Founding Fathers were responsible for establishing the Declaration of Independence in 1776. These political leaders, including George Washington, Ben Franklin and Thomas Jefferson, were instrumental in initiating, or founding American Independence.