George Wald was an influential American biologist known for his groundbreaking work in the fields of biochemistry and physiology, particularly concerning vision. He studied the biochemical processes in the retina and contributed significantly to our understanding of how light is converted into chemical signals, which are essential for sight. His research advanced the knowledge of how visual pigments function and laid the foundation for future studies in sensory biology. In addition to his scientific contributions, Wald was recognized for his strong ethical stance on various social issues. He was an advocate for environmental conservation and took a stand against nuclear weapons, emphasizing the importance of science in society. Wald believed that scientists have a responsibility to use their knowledge for the benefit of humanity and to address pressing global challenges. Throughout his career, Wald received numerous accolades, including the Nobel Prize in Physiology or Medicine in 1967, which he shared for his discoveries related to vision. His work not only enhanced our scientific understanding but also inspired future generations of researchers and underscored the vital role of science in addressing contemporary societal issues. George Wald was an influential American biologist known for his groundbreaking work in the fields of biochemistry and physiology, particularly concerning vision. He studied the biochemical processes in the retina and contributed significantly to our understanding of how light is converted into chemical signals, which are essential for sight. His research advanced the knowledge of how visual pigments function and laid the foundation for future studies in sensory biology. In addition to his scientific contributions, Wald was recognized for his strong ethical stance on various social issues. He was an advocate for environmental conservation and took a stand against nuclear weapons, emphasizing the importance of science in society. Wald believed that scientists have a responsibility to use their knowledge for the benefit of humanity and to address pressing global challenges. Throughout his career, Wald received numerous accolades, including the Nobel Prize in Physiology or Medicine in 1967, which he shared for his discoveries related to vision. His work not only enhanced our scientific understanding but also inspired future generations of researchers and underscored the vital role of science in addressing contemporary societal issues.