High Modernity was animated by a single generation of scientists, children born after the invention of the Dynamo and who died before the invention of Disco: roughly after 1870 and before 1970.
Alfred Newton (Newt) Richards, medical strong man of the famous wartime OSRD R&D outfit, whose dates (1876-1966) span the age almost perfectly, is an example of one such scientist who was influential when young and who continued to be highly influential up to the year he died.
A lot of important scientific discoveries and technological inventions happened in the 1870s, but there were a few highly influential bloopers as well.