The NATO Advanced Research Workshop on "White Dwarfs", held in June 2002 at the Astronomical Observatory of Capodimonte in Naples, Italy, continues the long tradition of the European Work shop series on "White Dwarfs", which started in Kiel in 1974 by Prof. Volker Weidemann. Since then, similar workshops were organized al most every two years: Frascati (1976), Tel Aviv (1978), Paris (1981), Kiel (1984), Frascati (1986), Toulouse (1990), Leicester (1992), Kiel (1994), Blanes (1996), Troms0 (1998) and Newark-Delaware (2000). The proceedings of these meetings, together with those from the IAU Colloquia in Rochester (NY, 1979) and Hanover (New Hampshire, 1988), represent a unique record of how the research field of white dwarfs has developed in more a quarter of a century. We hope that the present volume, which contains a large number ofcontributions on different topics, will provide an updated and broadened view of this very active field of research. th The format of this workshop, which is the 13 of the series, keeps that ofprevious meetings: givingthe same amount oftime to all speak ers, no parallel sessions and no limitations on the number of posters.