Final answer:
Leonardo da Vinci pioneered Sfumato in the Renaissance.
Step-by-step explanation:
The Renaissance artist who pioneered Sfumato was Leonardo da Vinci. He was known for his use of this technique in his paintings, most notably in the famous artwork Mona Lisa. Sfumato is a painting technique that involves the gradual transition between colors and tones, creating a soft and hazy effect.
Learn more about Sfumato in Renaissance Art