The book consists of scientific essays dedicated to A S Holevo on the occasion of his 80th birthday, written by prominent researchers in theoretical-mathematical physics. It is a snapshot of contemporary research at the frontier of quantum information science, work that builds on Holevo's pioneering contributions during the decades of his distinguished career.While a portion of the book are the 15 articles published in a special issue of IJQI, the book contains additional material such as a summary of Holevo's scientific life, with comments on research directions not covered in the 15 articles, and the list of his publications.