William David Coolidge: Architect of the Invisible The story of William David Coolidge is, in many ways, a testament to quiet brilliance and persistent dedication—a man who fundamentally reshaped our understanding of light and medicine without seeking grand recognition. Born in Hudson, Massachusetts, in 1873, Coolidge’s early life was marked by the profound loss of his mother at a young age, an experience that instilled within him a remarkable resilience and a deep appreciation for the practical realities of existence. His subsequent education at MIT, followed by rigorous study in Germany, l…