K. Barry Sharpless is an American chemist known for his significant contributions to the field of chemistry, particularly in the area of click chemistry. Born on April 28, 1941, he has received numerous accolades, including the Nobel Prize in Chemistry in 2001 and again in 2022. His work focuses on developing efficient and selective chemical reactions. Sharpless is also a professor at Scripps Research Institute in California. He has been influential in promoting the importance of green chemistry, which aims to design chemical processes that reduce waste and environmental impact. His research continues to inspire new methodologies in synthetic chemistry.