Hyman Brown, a professor of civil engineering at the University of Colorado at Boulder and the project engineer on New York's World Trade Center, will present a public lecture Wednesday, Sept. 19, on the collapse of the landmark structure. His talk, titled "The World Trade Center . . . Did We Make the Right Decisions in 1965?" will address such questions as why the buildings collapsed, whether anything could have been done during construction to minimize the disaster, and whether the towers should be rebuilt.