TV executive Robert is survived by his actor sons Owen, Luke and Andrew, and wife Laura, who is a photographer, reported ABC News.
Robert is credited with launching the TV career of PBS journalist Jim Lehrer and bringing "Monty Python's Flying Circus" to American TV for the first time, according to the KERA website.
He was also famous for improving the station's technology, including transitioning the broadcast to colour and switching from film to video tape.
Robert was diagnosed with Alzheimer's disease a few years ago. In 2015, Owen opened up about his father's diagnosis for the first time and admitted it had been difficult for the whole family to cope.
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