I am an experimental particle physicist. I am interested in properties of electron-positron collisions at the future linear collider at c.m.s. energies of hundreds of gigaelectronvolts. Specifically, we participate in our group in development of scintillation calorimeters for jet energy measurements, methods of calibration and stability monitoring using nanosecond LED flashes. We also study properties of modern photodetectors – silicon photomultipliers. For more details visit my page https://www.fzu.cz/~cvach/ , mostly in the Czech language.