Karl Pearson
David received a scholarship and continued her studies with Karl Pearson at University College, London, as his research assistant. In this function she produced tables for the correlation coefficient. When Pearson retired, his son Egon, and R. A. Fisher, took over Karl's duties. After Karl Pearson died in 1934, David returned to the Biometrics laboratory to work with Jerzy Neyman, submitting her four most recently published papers as her PhD thesis, and earned a doctorate in 1938.