Professor Liviu Librescu, 76, an Israeli engineering and math lecturer, was known for his research, but his son said the Holocaust survivor will be remembered as a hero for protecting students as ...

Liviu Librescu, a 75-year-old Holocaust survivor and professor of mechanical engineering, Zach Petkewicz, a senior, and Derek O'Dell, a 20-year-old sophomore all blocked the gunman from entering ...