Alexander Graham Bell was born in Edinburgh, Scotland, in 1847. Both his father and his grandfather studied the mechanics of a sound. Bell’s father was one of the pioneer teachers of speech to the deaf. Alexander Bell never planned to be an inventor. He wanted to be a musician or a teacher of deaf people. Between 1868 and 1870 Alexander worked with his father and studied speech and taught deaf children in Edinburgh. In 1870 he moved to Canada and the next year he went to the USA. In 1866 the nineteen year-old Bell thought about telegraph and he tried to find a way to send musical sound through the wires. In 1873 he worked as professor at Boston University. He was interested in the mechanical production of a sound and based his works on the theories of Helmholtz. It was possible for Bell to convert the sound wave vibrations into a fluctuating electric current and to carry sound across wires at the speed of light. Alexander Graham Bell invented the first telephone in 1876. He became a citizen of the United States in 1882. Bell was a modest humanitarian who once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone . both his mother and his wife were deaf. In tribute to Scotland and America, the inscription on Bell’s grave reads: ”Born in Edinburgh … died a citizen of the United States of America”. ”I wonder what the world would be like toady if the telephone hadn’t been invented; Sashe thinks to himself.”