LeSieg and Dr. Seuss have led almost mystically parallel lives. Born at the same time in Springfield, Mass., they attended Dartmouth, Oxford and the Sorbonne together, and in the army, served overseas in the same division. Seriously, Theo LeSieg is the pen name used by Theodor Geisel for books written by him and illustrated by others. LeSieg is Geisel backwards. Mr. Geisel is best know by another pen name: Dr. Seuss.