Liviu Librescu, 76, was a Holocaust survivor who, his son said, will be remembered as a hero. He "blocked the doorway with his body and asked the students to flee," Joe Librescu told the AP. "Students started opening windows and jumping out." The elder Librescu, a professor at Virginia Tech, was recognized internationally for his research in aeronautical engineering, the head of the Engineering Science and Mechanics Department at Virginia Tech told the AP. He was born and received his advanced degrees in Romania.