Yank Levy was a famous baseball player from the early 1900s who is known for introducing a new type of pitching style called the "curveball". This pitching style involves throwing the ball with a special spin, or curve, so that the batter can't predict which way the ball is going to go. This makes it much harder for the batter to hit the ball. Yank Levy is sometimes referred to as the "father of the curveball" because his style of pitching helped to make it popular in Major League Baseball.