What was Karl Popper's "claim to fame" and what year was this in?

Question

I have had a difficult time trying to find an answer.

Answer 1

He was a critical rationalist.

I found this Web site but I don't know if that will help. Hopefully it does. I know he had a lot to do with describing the relevance of using the scientific method of induction..although I don't know if this site really covers that:

http://www.marxists.org/glossary/people/...

Here's the part that I think applies to what you are asking:

Popper wrote extensively on the history and philosophy of science, his Objective Knowledge: An Evolutionary Approach, published in 1972 popularised the concept of “falsifiability” as a criterion of validity of a theory, and developed an epistemology which endeavoured to overcome the subjectivism of the dominant Logical Positivist currents.