Final answer:
Franklin D. Roosevelt is best known for his contributions during the Great Depression, which included the New Deal programs and the establishment of the WPA to counter the economic crisis.
Step-by-step explanation:
The Great Depression era personality best known for contributions such as the establishment of the Works Progress Administration (WPA) and various New Deal programs is Franklin D. Roosevelt (FDR). Elected in 1932, FDR introduced a wide range of economic regulations and social welfare programs aimed at alleviating the economic distress caused by the Great Depression, such as the Federal Deposit Insurance Corporation (FDIC), the Federal Housing Administration (FHA), and the Social Security Board. Another key personality from the era, Huey Long, challenged Roosevelt with proposals like the Share Our Wealth program but was assassinated before he could run for president against Roosevelt in 1936.