Option 1 is an incorrect match because Reinhold Messner is a renowned mountaineer, not associated with Computer Technology. He became famous as the first individual to climb all fourteen eight-thousanders in the world (peaks above 8,000 metres above sea level).

Option 2 is correctly matched as Harlow Shapley was a prominent 20th-century American astronomer. His work significantly contributed to our understanding of stars and the Milky Way Galaxy.

Option 3 is also correct. Gregor Mendel is known as the father of modern genetics. He is famous for his hereditary theory, based on experiments he conducted on pea plants in the 19th century.

Option 4 is accurate as well. Sir Godfrey Newbold Hounsfield was an English electrical engineer and inventor, known for developing the computed tomography (CT) scan. He and Allan McLeod Cormack jointly won the Nobel Prize in Physiology or Medicine for this invention in 1979.