This volume should be considered as required reading for both new and experienced researchers in a number of sub-disciplines where tetrapyrroles are studied or utilized in a variety of applications. A complete understanding of the chemistry of these compounds necessitates not only a knowledge of what has been accomplished in the area of synthesis and characterization but also a knowledge of what is possible in the future when using porphyrins and related tetrapyrroles as key components for applications in catalysis, energy production and biomedical applications.