Scottish-born inventor of the telephone, Alexander Graham Bell came to the United States in 1872 and demonstrated his first telephone four years later. The first commercial phone was offered a mere year later. Bell also worked on early aircraft designs, but none of his other efforts equalled the profound impact of the telephone. Bibliography: Schuman, Michael A.. Alexander Graham Bell: Inventor and Teacher. Springfield, NJ : Enslow Publishers, c1999. Linder, Greg ; consultant, Judith Tulloch. Alexander Graham Bell : a photo-illustrated biography. Mankato, Minn. : Bridgestone Books : Published by Capstone Press, c1999. Fisher, Leonard Everett. Alexander Graham Bell. New York : Atheneum Books for Young Readers, c1999.