The primary processes of photosynthesis lead to transformation of solar radiation into electrochemical Gibbs energy - the driving force for life on Earth. These intricate and fascinating processes have been researched and analysed for generations and in this two part set the Editor has brought together contributions from numerous leading scientific experts providing a compendium of information offering the most up-to-date understanding of the primary processes of photosynthesis. In addition to providing high quality structure information at atomic resolution for a range of reaction centres and antenna complexes the contributors have competently summarized the current knowledge on the mechanisms of light harvesting, charge separation, electron transport, water cleavage and ATP synthesis. This outstanding work represents the activity of researchers across the globe and will be of utmost interest to all those working in the fields of Photochemistry, Bio-organic Chemistry, Bio-inorganic Chemistry, Crystallography, Biological Sciences, Biochemistry and related disciplines.