Delivers a systematic account of the branching process, with special emphasis on developments that have taken place since 1972. Unifies the several methods given in different research papers and journals. The book is divided into two parts. Part I comprises five chapters dealing with the various types of ordinary branching process, such as Galton-Watson branching process, Markov branching process, Bellman-Harris branching process, and branching process with random environments. Part II offers a more detailed look at specific questions associated with branching processes and discusses subjects currently under investigation. Topics covered include branching processes with immigration, branching process with disasters, estimation theory in branching processes, and branching processes and renewal theory. Contains many examples, exercises and summaries.