Who are the other Trump officials Michael Cohen named in his testimony?

Michael Cohen, the former personal attorney of U.S. President Donald Trump, testifies before a House Committee on Oversight and Reform hearing on Capitol Hill in Washington, U.S., February 27th, 2019. Photo credit: Jonathan Ernst/Reuters

During his testimony in front of the House Oversight and Reform committee on Wednesday, Trump’s former attorney Michael Cohen said Trump committed insurance fraud, and that three former Trump Organization officials would know more. Michael Cohen named Allen Weisselberg, Ron Lieberman, and Matthew Calamari. Who are they, and are they key to understanding Trump’s murky finances?