Richard A. Posner, an influential federal appellate judge and pioneering scholar in law and economics, has passed away at the age of 87. His contributions to the legal field have been widely recognized, making him one of the most-cited legal scholars of the 20th century. The University of Chicago Law School, where he served as a senior lecturer, mourns the loss of this legal giant, who was known for his unique approach that integrated economic principles into American law. Colleagues and students remember him as a tireless and thorough judge, whose influence on law was beyond compare.