Gustaaf Adolf Frederik Molengraaff

Gustaaf Adolf Frederik Molengraaff 1860-1942

Gustaaf was a Dutch geologist. He discovered the Bushveld Igneous Complex. He also invented the dog tag:

Meanwhile the Boer War still had his attention. One of his ideas was to give each soldier a small tin identity card, which later became practice in armies around the world. - Wikipedia

Just in case you ever wondered where the idea came from.