Hey, I know that guy! That's Chris, one of my closest friends here in Toronto. He's the Superintendent for Construction on the Trump Tower at the corner of Bay and Adelaide in downtown Toronto. This video has him talking some about the project.
The video doesn't say this, but Chris and his wife are from Seattle. He was brought to Toronto for this project because he has experience with a particular construction technique called pre-stressed concrete. If understand it correctly, if you put concrete under load laterally via cables running through the material, it can bear more weight for a given thickness than more traditional floor designs. I can safely say that Chris knows more about concrete than anybody I know (including my architect friends)!