Peter Courtland Agre is an American physician, Nobel laureate, and molecular biologist. He is best known for his discovery of aquaporin water channels, which are crucial for fluid transport in living organisms. This groundbreaking work earned him the 2003 Nobel Prize in Chemistry, which he shared with Roderick MacKinnon. Beyond his scientific achievements, Agre has been an outspoken advocate for science diplomacy and public health, serving as the director of the Johns Hopkins Malaria Research Institute.