Bosonization is a useful technique for studying systems of interacting fermions in low dimensions. It has applications in both particle and condensed matter physics. This book contains reprints of papers on the method of bosonization as it is used in these fields. The papers range from the classic work by Tomonga in the 1950s on one-dimensional electron gases, through the discovery of fermionic solutions in the 1970s, to integrable systems and bosonization in Reimann surfaces. A pedagogical introduction is designed to make the book accessible to beginning students as well as researchers.