This book is concise and to the point. It explores Bohr's life and his work on the atom. It also concisely presents the work and a short biography of other physicists that worked on quantum theory and on the atom. They are J.J. Thomson, Ernest Rutherford, Max Planck, Marie Curie, Albert Einstein, Werner Heisenberg, Erwin Schrodinger, Max Born, among others who helped develop the atomic model in the early 20th century.