Lazar appears unmasked with George Knapp in November 1989
In a follow-up interview in November 1989, Lazar appears unmasked and under his own name after the earlier anonymous “Dennis” broadcast. This explicitly connects the S-4 / Area 51 claim to Robert Scott Lazar.
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Background
Wikipedia separates the sequence into two steps: in May 1989 Lazar first spoke to George Knapp on KLAS-TV with his face hidden and under the pseudonym “Dennis”. In a later interview that November, he appeared unmasked and under his own name. This November interview is therefore not a second independent S-4 event, but the public identification of the earlier claims as Robert Scott Lazar’s.
Lazar continued to claim that he was connected to a secret Area 51 facility through contractor EG&G and the U.S. Navy. According to Wikipedia, EG&G stated it had no records on him; skeptics and the U.S. Air Force also dispute the alleged employment at a Nellis / Area 51 subsidiary. The entry is therefore useful as a separate media/disclosure event, but should not be read as independent confirmation of the technical core claims.