The Neutron Scattering Society of America (NSSA) held its second American Conference on Neutron Scattering (ACNS) on June 6-10, 2004 at the Conference Center on the University of Maryland campus. The attendance at the ACNS conference included 128 students and 345 other scientists, not including organizers. The conference was designed to be interdisciplinary within the neutron scattering community. It received assistance from the National Science Foundation, the Department of Energy, the various neutron scattering centers in the United States, and the Canadian Institute for Neutron Scattering/NRC. There were 35 oral, both invited and contributed, and poster sessions. These covered a wide range of fields, including soft and hard condensed matter, liquids, biology, magnetism, engineering materials, chemical spectroscopy, crystal structure, fundamental physics, and developments in neutron instrumentation.