A physicist.[ref]
https://magazines.hachettelearning.com/magazine/physics-review/19/2/the-nobel-prize-in-1909/. Independent biographical identity and professional specialization
Portrait of Guglielmo Marconi
. Source. Wireless telegraphy links the dynamics of a transmitter, propagation and the response of a receiver. A successful detector reading depends on that complete chain, rather than on the transmitter alone.
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Guglielmo Marconi (1874–1937) was an Italian inventor and electrical engineer, best known for his pioneering work in long-distance radio transmission. He is often credited with the development of the first practical system of wireless telegraphy, which laid the foundation for modern radio communications. In 1895, Marconi succeeded in sending and receiving radio signals over a distance of about 1.5 kilometers.