Alexander Graham Bell forever changed the world. The telephone and his many other landmark inventions rank among the most transforming and enduring of the modern era. But it was his work with the deaf, teaching as well as inventing tools to ease communication, that he considered his life's work. The son of a speech therapist father and hearing impaired mother, his stellar achievements in sound reproduction and aviation give proof that he fit his own definition of an inventor. He said, "An inventor a man who looks upon the world and is not contented with things as they are. He wants to improve whatever he sees, he wants to benefit the world." This is a compelling biography of a true scientific visionary. Oxford Portraits in Science is an on-going series of scientific biographies for young adults. Written by top scholars and writers, each biography examines the personality of its subject as well as the thought process leading to his or her discoveries. These illustrated biographies combine accessible technical information with compelling personal stories to portray the scientists whose work has shaped our understanding of the natural world.