Samuel M. Plato (1882-1957) was a prominent African American architect and builder who not only made important contributions to the African American community in Louisville but also achieved national recognition for his imaginative designs elsewhere in the country. He completed his education and began his career at a time when segregation and racism were major obstacles for African Americans who sought to pursue professional careers such as architecture. When Plato graduated from State University Normal School in Louisville in 1902 and completed his mail-order program in architecture with International Correspondence Schools, he became part of a small group of pioneering African American architects who made their mark early in the Twentieth Century.

Like other pioneers, Plato struggled against racism, helping pave the way for those who followed in his footsteps. During his early years in Marion, Indiana, he was successful in his fight to open up the building trade unions to African American workers. He was the first African American to be awarded a contract to build a post office, and he was one of only a few African American contractors to build federal government defense housing projects during World War II. Plato was successful because of his persistent efforts and because his reputation for quality and integrity could not be ignored.

Among the basic tenets of Plato's life was his belief in helping others to help themselves and devotion to his family, which was always at the center of his life. In 1939 he devised a plan to move his sister and her family off the old homestead in Waugh, Alabama, and into a new home nearby. Samuel and Elnora Plato helped to put several nieces and nephews through college and graduate school and Plato employed some of them on jobs in Louisville and Washington, D.C. Elnora Plato (1891-1975), his second wife, was his constant traveling companion and business manager. She had built her own successful dressmaking business before their mariage, and she used her own funds from this enterprise to help make Plato's dreams possible. She funded the cost of his sister's new house in Waugh and , on more than one occasion, she was able to keep their company from going bankrupt.

Plato designed and/or built a wide variety of buildings, including Greek Revival and Craftsman-style houses, elegant mansions, post offices, banks, churches, schools, office buildings, theaters and government housing projects. Eight of his buildings are listed on the National Register of Historic Places, including the Broadway Temple A.M.E. Zion Church in Louisville.

During his career he was in demand as a speaker at the Louisville Urban League, Tuskegee Institute and Hampton Institute. He was honored posthumously in 1960 by the Howard University School of Engineering and Architecture. He was admired and respected by everyone. Perhaps Elnora Plato summed it up best when she wrote"…he was a pioneer for years and he wanted his business to live. Then, too, he wanted to inspire young engineers."