Brainerd Clark Perry

Born into slavery, he successfully escaped 3 Sep 1838. He was a Social reformer, author and orator. Leader in US abolitionist movement. Supported women’s rights movement. Became licensed preacher (1839). Publisher and editor, The North Star (1847-1851), later Frederick Douglass’ Paper (1851-1860). Publisher and editor, the New National Era (1870). Nominated for Vice-President by the Equal Rights Party (1872). Appointed President, Freedmen’s Savings Bank (1874). Served as US Ambassador to Haiti (1889-1891). Works include: Narrative of the Life of Frederick Douglass, an American Slave (1845); My Bondage and My Freedom (1855); and Life and Times of Frederick Douglass (1st ed., 1881, revised, 1892).

Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer. He was praised as the "greatest humorist the United States has produced", and William Faulkner called him "the father of American literature". His novels include The Adventures of Tom Sawyer (1876) and its sequel, Adventures of Huckleberry Finn (1884), the latter of which has often been called the "Great American Novel".

Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman. He developed many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures.[4] These inventions, which include the phonograph, the motion picture camera, and early versions of the electric light bulb, have had a widespread impact on the modern industrialized world.

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 (AT&T) in 1885.

Bell's father, grandfather, and brother had all been associated with work on elocution and speech and both his mother and wife were deaf, profoundly influencing Bell's life's work. His research on hearing and speech further led him to experiment with hearing devices which eventually culminated in Bell being awarded the first U.S. patent for the telephone in 1876. Bell considered his invention an intrusion on his real work as a scientist and refused to have a telephone in his study.

Albert Einstein was a German-born theoretical physicist, widely acknowledged to be one of the greatest and most influential physicists of all time. Einstein is best known for developing the Theory of Relativity, but he also made important contributions to the development of the theory of quantum mechanics. Relativity and quantum mechanics are the two pillars of modern physics.