Dust Formation in Massive Stars and Their Explosive Ends

We review the observational evidence for dust formation in Wolf-Rayet binary systems and in Type II supernova ejecta. Existing theoretical models describing the condensation of solids in carbon-rich Wolf-Rayet stars and in supernovae close by and at high redshift are discussed. We describe new modeling of carbon- and oxygen-based grain nucleation using a chemical kinetic approach applied to the ejecta of massive pair-instability supernovae in the early universe. Finally, dust-formation processes in colliding-wind regions of WC binary systems are discussed.