There are more brief lives at
MacTutor History of Mathematics Archive
This archive is excellent for finding out quickly who was who in Mathematics. There are several links to it in this guide.
http://www.ucl.ac.uk/Stats/department/pearson.html
The Department of Statistical Science at UCL descends from Pearson’s Department of Applied Statistics.
On the Intellectual Versatility of Karl Pearson
R. H. Williams, Zumbo, B. D., Ross, D., & Zimmerman, D.W. (2003) Human Nature Review, 3: 296-301.
