sentences:  On his show, Quintanilla had once asked Allen Stanford, later known as the orchestrator of a "massive Ponzi scheme", how it felt to be a billionaire.From 2010 until September 2015, Quintanilla substitute-anchored weekday and weekend editions of "NBC Nightly News", covering when hosts Brian Williams and Lester Holt were on assignment or away.He also substitute co-hosted "Today".