The book "Amino Acid Biosynthesis - Pathways, Regulation and Metabolic Engineering" provides a comprehensive overview of the current state of knowledge in the microbiology of amino acids. It addresses both fundamental and applied aspects of amino acid biosynthesis, including the biochemical and genetic regulation of biosynthetic pathways. The discussion covers the transport mechanisms of amino acids as well as the genomics of the producing microorganisms. Special attention is given to the control mechanisms of amino acid biosynthesis, which offer important insights into the principles of genetic and biochemical regulation, including the role of transcriptional regulators and novel regulatory elements such as riboswitches. Furthermore, the metabolic engineering of microorganisms for the biotechnological production of amino acids is discussed, which are used in both pharmaceuticals and as additives in food and feed. The book provides extensive overviews of current advancements in the production of amino acids and dipeptides through fermentation and enzymatic catalysis, with a particular focus on the rational improvement of metabolic functions using recombinant DNA technology.