**David P. Billington *(1927-2018) was the Gordon Y. S. Wu Professor of Engineering Emeritus at Princeton University. His many books include Robert Maillart's Bridges and Power, Speed, and Form * (both Princeton).

**David P. Billington *(1927-2018) was the Gordon Y. S. Wu Professor of Engineering Emeritus at Princeton University. His many books include Robert Maillart's Bridges and Power, Speed, and Form * (both Princeton).