Andreas Nordvall Lagerås, Chalmers Coalescent processes and other models for genealogical trees abstract I will give an introduction to the so-called coalescent processes, which are certain Markov processes that describe the genealogy of a population. Such models are of great use in the field of population genetics, but a general theory for these processes has been developped as recently as in the last decade. I will present some results about what happens when mutations can appear in the population. Reduced branching processes are other kinds of models for genealogies, and I will also mention some current work on them and point to some similarities between them and coalescent processes.