The Steinhardt Social Reseach Institute (SSRI) and Cohen Center for Modern Jewish Studies at Brandeis University have released new estimates of the American Jewish population. In an effort to develop reliable estimates of the size and characteristics of the American Jewish population, the SSRI has used a data synthesis approach to yield estimates of the proportion of U.S. adults who claim Judaism as their religion, the number of secular/cultural Jews (i.e., Jews who identify other than by religion), and the number of children. The accumulated evidence indicates that the U.S. Jewish population is substantially larger than previously estimated.