Final answer:
Guglielmo Marconi is recognized for sending the first wireless radio message in 1901, across the Atlantic Ocean, using Morse code, later facilitated by advancements such as the vacuum tube.
Step-by-step explanation:
The individual credited with successfully sending the first wireless message through radio waves is Guglielmo Marconi. In 1901, Marconi managed to send a wireless signal across the Atlantic Ocean from Wales to Newfoundland, Canada, demonstrating the potential of wireless communication.
His endeavors paved the way for the establishment of the Marconi Wireless Telegraph Company, bringing into reality the practical use of radio waves for long-distance communication. Although Marconi's initial system only allowed for the transmission of Morse code, it set the foundation for future technological advancements, including the transmission of voice and sound.