John Logie Baird was a Scottish engineer, inventor, and television pioneer. He is best known for inventing the world's first mechanical television system. Baird's first successful demonstration of his television system was in 1926, when he transmitted images of objects from one room to another. In 1927, he became the first person to transmit live television images over a telephone line. Baird's work paved the way for the development of electronic television systems.