I will pick an artist whose work astounds me. In the
visual artist category,
Michelangelo Buonoratti
Sculpture
Painting
Architechture
"Michelangelo stands as a unique, almost mythic, presence in the history of art. For many, he embodies the Italian Renaissance and his work stands as its most eloquent expression. Atthough he was probably the most influential visual artist who ever lived, Michelangelo was as comfortable composing verse as he was sculpting stone, and as meticulous in supervising the details of quarrying the marble for his statues as in craftingthe details that adorn his architectural masterpieces."
-William E Wallace
For me, he is the absolute master in sculpture, and I find he also painted with few peers. The detail and realism in his art astounds.
Born 1475 Caprese.
Died 1564 Rome.
What he managed to accomplish in that time frame is staggering. I imagine most who read this will be aware of the Sistine Chapel and the statue of David, and those are two works of awe inspiring talent; but I will focus on my favorites.
Sculpture: No offense to David and the right hand of God, but for me the Pieta (Rome) defies comparison.

Note the fine details in the hands and the drapes/robes of Mary.
The tomb of Pope Julius II in SanPietro in Vincoli containing his statue of Moses is another I love. And of special note I am very fond of the Medici tombs in San Lorenzo, specifically that of Lorenzo and the attendant statues of Dawn and Dusk (below).
Painting: again we are all likely familiar with the Sistine chapel, and again I think it is brilliant; but I offer up the Doni Tondo to illustrate his painting...
This was the highlight of the Uffizi for me. Just so different from what had come before, not in content but style. It is said by scholars that nothing in his past can explain what happened. Why would Agnolo Doni commision a sculptor to do a painting? Why did he agree to do so? Michelangelo only had limited experience in tempera painting, yet created this masterpiece upon first effort.
"...the beauty, invention, and subtle intelligence of this picture."
Wallace
I won't go into all the details that experts can read from this painting. The movement, geometry, and symbolism of the holy trinity. Wallace sums it up thusly:
"In this stunningly beautiful and highly crafted object, Michelangelo presents an image of the Christian church, as history, physical space, and visible doctrine.