Buck Franklin is best known for defending African-American survivors of the 1921 Tulsa race riot, in which whites had attacked many blacks and buildings, and burned and destroyed the Greenwood District. This was known at the time as the "Black Wall Street", and was the wealthiest Black community in the United States, a center of black commerce and culture. In 2015 Buck Franklin's previously unknown written eyewitness account of the 1921 Greenwood attack, a 10-page typewritten manuscript, was discovered and subsequently obtained by the Smithsonian's National Museum of African American History and Culture. Franklin and his colleagues also became experts at oil law, representing "blacks and Native Americans in Oklahoma against white lawyers representing oil barons." His career demonstrated a strong professional black life in the West, at a time when such accomplishments would have been more difficult to achieve in the Deep South.