Joel Greenberg, a central figure in the ongoing investigation into Florida Republican Rep. Matt Gaetz, has been providing information to investigators since last year about Gaetz’s activities, among other topics, two people briefed on the matter told The New York Times.Joel Greenberg, a central figure in the ongoing investigation into Florida Republican Rep. Matt Gaetz, has been providing information to investigators since last year about Gaetz’s activities, among other topics, two people briefed on the matter told The New York Times.