Attendees can learn about IWitness on the expo floor at the Extreme Networks booth through Wednesday.

Barbara Wahlberg can trace her passion for teaching the Holocaust back to one breakfast in Long Island, New York.She was at a restaurant with her husband when she noticed something unusual about the cook who brought out their food: he had a number tattooed on his arm.She asked her husband what it was, and he told her it meant that the man had been in a concentration camp in Europe during World War II. Wahlberg had never heard of these tattoos, and was shocked that this man – so tall and strong – had experienced such an injustice.