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In page DeForest Kelley:

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Kelley was born in Atlanta, Georgia. His mother was Clora (née Casey) and his father was Ernest David Kelley, a Baptist minister of Irish ancestry.[1][2][3][4] Kelley was named after pioneering electronics engineer Lee de Forest. He later named his Star Trek character's father "David" after his own father.[citation needed] Kelley had an older brother, Ernest Casey Kelley.[5] Kelley was immersed in his father's mission at his father's church in Conyers, Georgia.[6]