• Astrometry (Gaia)
• Stellar Atmospheres
• Late Stages of Stellar Evolution
• White Dwarfs
• Magnetic Fields in White Dwarfs
• Atoms and Molecules in Strong Magnetic Fields
• Chemical Abundances in White Dwarfs
• X-ray Emission from White Dwarfs
• Surveys for Hot Stars
• Evolutionary Strategies and Genetic Algorithms

I have worked particularly on

• Outreach for the Gaia mission
• Visualisation of Gaia data
• Data Access for Gaia
• First Look for the Gaia mission
• One-day Astrometric (ODAS)
• First Look and Science Quick Look for the DIVA Astrometry Mission
• Onboard Software for the DIVA Satellite
• Polarized Radiative Transfer in Magnetized Stellar Atmospheres
• Probing Gravitational Theories with Polarization Measurements
• Search for Weak Magnetic Fields in White Dwarfs, sdB stars and Central Stars of PN
• Interpretation of the Spectra and Polarization of Magnetic White Dwarfs
• Zeeman Tomography of Magnetic White Dwarfs with Evolutionary Strategies and Genetic Algorithms
• Consistent Interpretation of the Zeeman and Cyclotron Sprectra of AM Herculis Stars
• Search for Fast Rotating Magnetic White Dwarfs
• Test of Calculations for Atoms and Molecules in Strong Magnetic Fields
• Interpretation of EUV and X-ray Measurements of White Dwarfs
• Chemical Abundances of White Dwarfs
• Chemically Stratified Atmospheres of White Dwarfs
• Search for Faint Blue Stars in the Hamburg Quasar Survey, Hamburg ESO Survey, and SLOAN Digital Sky Survery
• Hydrodynamical Simulations of Convection in White Dwarf Atmospheres
• Stellar Dynamical Investigation of the White Dwarfs in the Proposes Hyades Supercluster