Question: Charles Louis Critchfield earned his PhD in Physics from George Washington University under the direction of which theoretical physicist who was known as "the father of the hydrogen bomb."
Sentence (from "Charles Critchfield"): A graduate of George Washington University, where he earned his PhD in Physics under the direction of Edward Teller in 1939, he conducted research in ballistics at the Institute for Advanced Study in Princeton and the Ballistic Research Laboratory at the Aberdeen Proving Ground, and received three patents for improved sabot designs.
Relevant evidence: Yes