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Alexander Graham Bell was a Scottish-born scientist, inventor, engineer, and innovator who is credited with inventing and patenting the first practical telephone. He also founded the American Telephone and Telegraph Company in 1885. While not the best student, Bell had an uncanny talent for problem solving. At 12 years old, he invented a farming device for his friend’s father that quickly and efficiently removed the husks from wheat grain. After being home schooled and attending private school for a year, Bell went on to the Royal High School at Edinburgh but eventually dropped out because he didn’t enjoy the mandatory curriculum.

source: HISTORY.com

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Edwin Laurentine Drake, also known as Colonel Drake, was an American businessman and the first American to successfully drill for oil.Raised on farms in New York and Vermont, Drake worked as a hotel and dry-goods clerk before becoming an agent for the Boston and Albany Railroad. In 1850 he became a conductor on the New York and new haven railroad, but a few years later he had to retire for health reasons. In 1857, while living in New Haven, Connecticut, Drake met stockholders of the Pennsylvania Rock Oil Company, which claimed a lease on land near Pennsylvania, where oil had been gathered from ground-level seepage for medicinal uses.

source: Britannica.com

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Andrew Carnegie was a Scottish-American industrialist, business magnate, and philanthropist. Carnegie led the expansion of the American steel industry in the late 19th century and is often identified as one of the richest people. He became a leading philanthropist in the United States and in the British Empire. In 1848, the Carnegie family moved to America in search of better economic opportunities and settled in Allegheny City (now part of Pittsburgh), Pennsylvania.

source: HISTORY.com

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Henry Bessemer was an English inventor, whose steel-making process would become the most important technique for making steel in the nineteenth century for almost one century from 1856 to 1950. Henry Bessemer was born on January 9, 1813 in Hertfordshire, England. His father, Anthony Bessemer, was also an inventor, as well as a printer and typesetter, and he gave Henry a love of working with metal. At the age of 17, Henry Bessemer relocated to London, where he began to pursue a career as an inventor. Many important inventions are answers to specific problems, and Henry's first one was no different.Although Henry Bessemer received more than 100 patents during his lifetime, his most famous invention was the Bessemer Process, which created a new way of manufacturing steel.

source: study.com

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Elias Howe Jr. was an American inventor best known for his creation of the modern lock stitch sewing machine. Elias Howe was born on July 9, 1819, in Spencer, Massachusetts. Howe was born with a disability that left him weak in one arm. Howe went to court to ensure he was provided royalties for his invention. The court ruled in Howe's favor in 1856 and he earned the millions on his invention he had envisioned.

source:  study.com