 The system is commonly called R&K or Rechtschaffen and Kales, named after its key developers.R&K was used from 1968 to 2007 when "The AASM Manual for the Scoring of Sleep and Associated Events" was published by the American Academy of Sleep Medicine (AASM).Rechtschaffen, who was born in the Bronx, is currently Professor Emeritus in the Department of Psychiatry and Psychology at the University of Chicago.