Leonard Porter Ayres was an American statistician. He played a central role in developing and analyzing large-scale statistical projects, especially for the Russell Sage Foundation. His best-known work dealt with comprehensive statistical studies of American casualties in the first and second world wars.

Willard Cope Brinton was an American consulting engineer, president of Brinton Associates, and information visualisation pioneer, particularly known for publication of the 1914 textbook on graphic methods, entitled Graphic methods for presenting facts.