Donald Friedman, a structural engineer, is the president of Old Structures Engineering and lives in New York City. He is the author of Historical Building Construction; After 9-11: An Engineer s Work at the World Trade Center; The Investigation of Buildings; The Design of Renovations, with Nathaniel Oppenheimer; and Building the Empire State with Carol Willis.
Participating Programs
![](https://skyscraper.org/wordpress/wp-content/uploads/2023/04/Building-the-Empire-State-250x375.png)
Building the Empire State
![](https://skyscraper.org/wordpress/wp-content/uploads/2023/01/Rewriting_thumbnail-250x375.jpg)
Rewriting Skyscraper History: Looking Back from the 21st Century
![](https://skyscraper.org/wordpress/wp-content/uploads/2023/01/Work-in-Progress_thumbnail-250x375.jpg)
Work in Progress: Construction History in New York and Chicago, 1870-1930
![](https://skyscraper.org/wordpress/wp-content/uploads/2022/05/Flatiron-250x375.jpg)
CONSTRUCTION HISTORY ROUNDTABLE: Work in Progress
![](https://skyscraper.org/wordpress/wp-content/uploads/2022/02/Screen-Shot-2022-01-31-at-1.01.59-PM-250x375.png)