Heinrich Claisen was a German chemist born on March 16, 1870, known for his contributions to organic chemistry. He is best recognized for the Claisen condensation, a reaction that allows the formation of β-keto esters from esters and carbonyl compounds. This reaction is significant in the synthesis of various organic compounds. Claisen's work extended beyond just one reaction; he also studied the properties of enols and enolates. His research laid the groundwork for many modern organic synthesis techniques. Claisen's influence is still felt today in both academic and industrial chemistry, making him a notable figure in the field.