The national security controls that regulate access to and export of science and technology are broken. As currently structured, many of these controls undermine our national and homeland security and stifle American engagement in the global economy, and in science and technology. These unintended consequences arise from policies that were crafted for an earlier era. In the name of maintaining superiority, the U.S. now runs the risk of becoming less secure, less competitive and less prosperous. [It] provides an account of the costs associated with building walls that hamper our access to global science and technology that dampen our economic potential. The book also makes recommendations to reform the export control process, ensure scientific and technological competitiveness, and improve the non-immigrant visa system that regulates entry into the United States of foreign science and engineering students, scholars, and professionals.