These conference proceedings contain review papers and contributed papers discussing early results from the Infrared Space Observatory (ISO) on the subject of stellar evolution. Three topics have been emphasized in the book: young stellar objects and Vega-type stars, circumstellar matter of massive stars, and late stages of stellar evolution. The harvest of results from ISO is demonstrated by the many discoveries of solid state and molecular bands in the spectra of stars and circumstellar shells, and by images of circumstellar and interstellar matter. The book is intended for professional astronomers and students.