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Donald Friedman, PE (he/him/his)

President
Old Structures Engineering

Donald Friedman is president of Old Structures Engineering, PC. A professional engineer with over 35 years experience in the investigation, analysis, and restoration of landmark buildings, Mr. Friedman holds a B.S. in Civil Engineering from Rensselaer Polytechnic Institute, an M.A. in Historical Studies from the New School for Social Research, is a licensed engineer, and a Fellow of the Association for Preservation Technology and the American Society of Civil Engineers.

Mr. Friedman’s design experience includes the integration of modern construction into existing buildings with archaic and obsolete structural systems; repair and restoration of steel, masonry, iron, wood, and concrete structures; and the investigation of historic buildings to determine structural type and condition.

In addition to Mr. Friedman’s project work, he has taught engineering of historic buildings at the Rensselaer Polytechnic Institute, the University of Massachusetts at Amherst, and Columbia University. He is the author of The Structure of Skyscrapers in America, 1871-1900; After 9-11: An Engineer’s Work at the World Trade Center; Historical Building Construction; and The Investigation of Buildings, and the co-author of Building the Empire State and The Design of Renovations.

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