Alexander Graham Bell was a scientist, inventor, and engineer. He is credited with inventing the first functional telephone. He is also credited with co-founding America's major telephone company AT&T, which has been going strong since 1885. Bell's later life was marked by his groundbreaking work in aeronautics, hydrofoils, and optical telecommunications. He was also an ardent supporter of compulsory sterilization.
Scottish inventor, electrical engineer, and innovator, John Logie Baird, is best known for demonstrating a working TV system in 1926. He then went on to invent the first viable purely electronic color TV picture tube and founded the Baird Television Development Company. He was inducted into the Scottish Engineering Hall of Fame in 2015.
Kirkpatrick Macmillan was a 19th-century Scottish blacksmith generally credited with inventing the pedal-driven bicycle. He allegedly completed constructing a pedal-driven bicycle of wood in 1839. The bicycle included iron-rimmed wooden wheels and a steerable wheel. However, there is no concrete evidence to prove that he was indeed the inventor of the first pedal-driven bicycle.