Robert Sandmeyer was a prominent American chemist known for his contributions to organic chemistry. He is best recognized for the Sandmeyer reaction, a chemical reaction that allows for the conversion of aryl amines into aryl halides using copper salts. This reaction is significant in the synthesis of various organic compounds. Born in 1880, Sandmeyer conducted much of his research at Johns Hopkins University. His work has had a lasting impact on the field of chemistry, influencing both academic research and industrial applications. Sandmeyer's legacy continues to be felt in modern organic synthesis techniques.