Question: In what year did Leroy Sievers begin serving as the executive producer "Nightline"?
Sentence (from "Ted Koppel"): Edward James Martin "Ted" Koppel (born February 8, 1940) is a British-born American broadcast journalist, best known as the anchor for "Nightline", from the program's inception in 1980 until 2005.
Relevant evidence: Yes