Thomas Coulson (1887-1970) was a British-born American historian of science and technology, known for his long and influential work at the Franklin Institute in Philadelphia. During his career, he held several prominent positions within the institute, including Director of the Museum and Editor of the prestigious *Journal of the Franklin Institute*, helping to shape its scientific and educational direction. As an author, he specialized in biographies of key figures in science and technology. His most important works include *Elihu Thomson, Beloved Scientist* (1944) and, notably, *Joseph Henry: His Life and Work* (1950), a fundamental study of the American physicist. For his exceptional contribution to historiography, particularly for his work on Henry, Coulson was awarded the inaugural Dexter Prize by the Society for the History of Technology (SHOT) in 1968, one of the highest honors in his field.