Books are landmarks in the history of sciences. Some reflect the views of influential opinion leaders in a certain period—as it was common in the past. Some reflect the state of the art on a particular field reviewed by multiple authors—as became frequent nowadays. Some still reflect a combination of both tendencies collecting the opinion of several authors under the general framework of the leading opinion of an Editor. In this last case the Editor is also an active writer of seminal chapters. This was the case of the first edition of Principles of Behavioral and Cognitive Neurology, edited by M.-Marsel Mesulam.