Introduction

The International Symposium on Quantum Fluids and Solids (QFS) for the year 2009 will be held at Northwestern University, August 5-11. This conference continues a long standing tradition of such conferences from 1975, conferences held two out of every three years, skipping the year of the International Low Temperature Conference where the subjects traditionally developed in quantum fluids, solids, and gases are well represented. The last such Low Temperature Conference was held in Amsterdam, August 6-13, 2008. The previous year the QFS2007 was in Kazan, QFS2006 was in Kyoto, and QFS2004 in Trento. The history of these conferences is descibed by Bob Hallock, chair of QFS1998, http://people.umass.edu/qfs98/info1.htm