Explanation:

- Jonas Salk: Developed the first effective polio vaccine in the 1950s. His work led to a significant drop in polio cases worldwide.

- Linus Pauling: A renowned chemist known for research in chemistry and peace activism, but not related to the polio vaccine.

- Robert Wellberg: Not a notable figure in the development of the polio vaccine. This name does not relate to well-known scientific accomplishments in this context.

- Ernest Haeckel: A German biologist known for his work in evolution and embryology, not for the polio vaccine.