The claim that he is "best known" for something is an opinion, and if you can find someone else who expressed that opinion, it doesn't change its subjective nature.  NPOV is a core policy and your wording violates it.  If you think that this would imply that every sentence is opinionated, then you have badly misunderstood the policy.  Nor does the sentence as I wrote it imply anything about what else he did in his career.  I notice that you have not given an answer to my question - what do you think you are adding to the article by forcing your opinion into it?  Exactly what is your problem with stating the facts alone without applying a judgement to them?  190.162.52.196