groundbreaker (noun)

1. Walt Disney was a groundbreaker in the world of animation, revolutionizing the industry with the creation of Mickey Mouse and introducing innovative techniques.

2. Stephen King is a renowned groundbreaker in the horror genre, his novels and stories have set new standards and inspired countless writers.

3. Pablo Picasso was a groundbreaker in the art world, his unique style and contributions to the development of Cubism reshaped modern art.

4. The invention of the printing press by Johannes Gutenberg in the 15th century was a groundbreaker in history, helping to revolutionize the spread of knowledge and information.