Tina Strobos, a medical student in Amsterdam during World War II who helped save more than 100 Jews from the Nazis, has died.

Strobos, who had joined the Dutch resistance and later was recognized as a Righteous Among the Nations, died Feb. 27 at the age of 91.

Strobos and her mother, Marie Schotte, were recognized in 1989 as righteous gentiles for hiding more than 100 Jewish refugees in small groups on the upper floors and in the attic of the family’s home, a boarding house. They provided their Jewish guests with food and medicine and, ultimately, false passports. The home was a 10-minute walk from the home of Anne Frank.  

She was detained and questioned by the Nazis nine times. Strobos also delivered guns, explosives and radios on her bicycle.

Strobos immigrated to the United States in 1951, became a naturalized U.S. citizen and practiced psychiatry in New York until two years ago.

She told the New York Times in a 2009 interview that “It’s just the right thing to do. I believe in heroism, and when you’re young, you want to do dangerous things.”