A Russian-American biologist, photographer, linguist, art historian, philosopher, and professor, Vishniac is best remembered for producing a photographic record of Central and Eastern European Jewish communities in the years preceding the Holocaust. His efforts were not without risk; he was imprisoned 11 times and forced to do hard labor in two concentration camps. He escaped to the US in 1940 and returned to his scientific roots, contributing to the development of what photographic techniques? Discuss
Source: The Free Dictionary