I am interested in compact binaries (mostly with white dwarfs), neutron stars, and large-scale surveys at X-ray and optical wavelengths. I am the co-investigator and the chairman of the Compact Objects working group of eROSITA, I am co-investigator of the XMM-Newton Survey Science Centre, co-chair of the topical panel Endpoints of Stellar Evolution for the ESA L-class mission ATHENA (launch 2031+) and lead activities to identify Compact Binaries in SDSS-V.
Among my publications (complete ADS list since 1985, or just refereed ) one finds those dealing with compact objects and large-scale surveys but also those focusing on active galactic nuclei (AGN), clusters of galaxies. Others are addressing topics like light pollution (or sky protection) and Doppler tomography.