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Source: https://www.youtube.com/watch?v=ezHc9x75808
Donald Friedman, P.E., F.ASCE, is a professional engineer with more than 30 years of experience in the investigation, analysis, and restoration of landmark buildings. He has taught engineering at Rensselaer Polytechnic Institute, the University of Massachusetts at Amherst, and Columbia University; he has spoken at numerous conferences including the fourth and fifth ASCE Forensics Conference; he is the author of After 9-11: An Engineer’s Work at the World Trade Center ... Read even more
