The Polio Vaccine Pioneer crossword solutions are Albert Sabin and Jonas Salk. Albert Sabin was a Polish-American medical researcher who developed the oral polio vaccine in the 1950s. His vaccine was the first to be widely used and is still used today in many parts of the world. Jonas Salk was an American medical researcher who developed the first successful inactivated polio vaccine in the 1950s. His vaccine was the first to be licensed for use in the United States and is still used today in many parts of the world.