Massive stars: setting the stage.- I. Number and Distribution of Massive Stars.- The massive star distribution in the Galaxy and the Magellanic Clouds.- Massive star distribution in external galaxies and starburst region.- Dissection of 30 Doradus and a discussion of the Magellanic Cloud OB-associations.- Blue and red supergiants and the age structure of the NGC 330 region.- Stars in young clusters in the Magellanic Clouds.- The population of massive stars in R136 from HST/FOC UV observations.- Spectral synthesis of spectral populations using Balmer lines.- The stellar content of the Orion OB1 association.- II. Massive Star Atmospheres and Stellar Winds.- Observations of the atmospheres and winds of O-stars, LBV's and Wolf-Rayet stars.- Radiation driven winds of hot stars: theory of O-star atmospheres as a spectral tool.- The chemical composition of B-supergiant atmospheres.- Intrinsic parameters of massive OB-stars.- Line blanketing by iron group elements in non-LTE model atmospheres of hot stars.- A comparison between observed and predicted mass loss rates and wind momentum of O stars.- LTE and NLTE abundances in A supergiants: a test of their evolutionary status.- A spectroscopic analysis of B-stars in the SMC cluster NGC 330.- Hydrodynamic atmosphere models for hot luminous stars II. Method and improvements over unified models.- Hubble space telescope spectroscopy of massive hot stars in the Magellanic Clouds and M31.- Stellar winds of massive stars in M31.- O-star winds in the Magellanic Clouds and the Milky Way.- On the relation between the mass loss rate and the stellar parameters of OB-type stars.- Wind asymmetries in massive stars.- NLTE analysis of hot binaries.- Effective temperatures and surface gravities of early type stars.- The atmospheric composition, extinction and luminosity of the LBV star R71.- The variability of Eta Car: a tool for the LBV phenomenon.- The nature of the luminous blue variable AG Car.- The evolutionary status of Eta Car based on historical and modern optical and infrared photometry.- The gradual acceleration of the outflow of VX Sagittari; a stellar evolution effect?.- The complex H-alpha profile of the hypergiant HR 8752 during 1970-1992.- Spectral analysis of Wolf-Rayet stars: theory, results, conclusions.- Line-blanketed non-LTE atmosphere models for Wolf-Rayet stars.- The fundamental parameters of the central stars of eight WR ring nebulae.- Tailored analysis of 24 galactic WN stars.- Oxygen and carbon abundances for the WO stars.- HD190918: arbiter between models for Wolf-Rayet stars.- III. Structure and Evolution of Massive Srars.- Structure and evolution of massive stars: mixing processes and stellar evolution.- Overshooting from convective cores: theory and numerical simulation.- Massive close binaries. observational characteristics.- Doppler tomography of O-type binaries; the physical properties of seven systems.- Evolution of massive close binaries.- Massive single star evolution: comparison with observations.- Presupernova evolution of the most massive stars.- Properties of massive star evolution.- Nucleosynthesis in massive stars.- Results of evolutionary computations of primaries of close binaries with different initial composition.- The mass and helium discrepancy in massive stars: the case Vela X-1.- On the evolution of secondary components in massive close binary systems.- Double-zone model with diffusive mixing and the mass and helium discrepancies in OB stars.- The impact of semi-convection and overshooting on the surface abundances in massive stars.- Improved bolometric corrections for WR stars.- Wolf-Rayet stars in starbursts.- A study of the SMC cluster NGC330.- The evolution of massive stars to explosion.- SN1987A and SN1993J: testing stellar evolution theory.- Chemical and photometric evolution of elliptical galaxies.- A model for the chemical evolution of the solar neighborhood using metallicity dependent yields.- Poster list.- Summary.

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