by the mid 1930s cramér's attention had turned to look at the approach of the english and american statisticians such as fisher , neyman and egon pearson ( karl pearson 's son).

This is all lower case. Can you fix that?
By the mid 1930s Cramér's attention had turned to look at the approach of the English and American statisticians such as Fisher , Neyman and Egon Pearson ( Karl Pearson 's son).