The excited leptons that share the quantum numbers with the Standard Model leptons but have larger masses are widespread in many promising new physics models. After a brief introduction to the particle compositeness and possible subsubstructure I will discuss the experimental searches for the excited leptons. Then I will present new scenarios for possible generation of the baryon asymmetry of the universe in theories with these new particles. These baryogenesis mechanisms do not contradict to the small neutrino masses and the proton stability, and can be interesting for the collider experimentalists.