Sep 11, 2007 -- A “renegade angel” is how Sally Regenhard likes to remember her son, Christian, a probationary firefighter who was killed in the September 11 attacks on the World Trade Center six years ago. Regenhard summoned her son’s memory at a 9/11 memorial event at Yeshiva University this year, organized by the student councils of Stern College for Women and Yeshiva College. “He was a beautiful soul,” she told the crowd of 175 students who were gathered to commemorate the attacks. Christian was a rock climber, marathon runner, and avid writer, who was working on a screenplay about children murdered in the Holocaust before his death. He graduated from the New York Fire Department just six weeks before the tragedy. “He was planning on finishing college and moving on from the fire department,” she said. The 28-year-old firefighter remains missing, along with his entire Engine Company 279. “We lost a lot of wonderful people that day,” said Regenhard, a Bronx native. “I thought my son was unique in the world, but as I spoke to other people, I realized that there were so many others who were also beautiful, whose stories also needed to be told.” Regenhard and her family created the Skyscraper Safety Campaign in Christian’s memory to improve the city’s fire codes, safety, and emergency communication, and petition Congress to investigate the collapse of the towers. “In my son’s memory I will continue to speak the truth,” she said. “If we don’t understand the failures of the past, we are doomed to repeat them.” Originally conceived to represent the 17 probationary firefighters lost at the site, the organization quickly expanded to include the families of all firefighters, emergency workers, and civilian victims of 9/11. The group advocates for proper retrieval of all the human remains at Ground Zero. The students gathered to hear Sally Regenhard speak were clearly moved. They sang The Star-Spangled Banner and recited El Male Rachamim, a Jewish memorial prayer. “I thought it was important to bring back the memory of a hero lost on that tragic day,” said Yosef Weg, a Yeshiva College junior. “We wanted to remember those who were lost by trying to better the future,” said Rena Wiesen, president of the Stern College Student Council.