Henry Gustav Molaison (February 26, 1926 December 2, 2008), better known as HM or H.M., was a memory-impaired patient who was widely studied from the late 1950s until his death. His case played a very important role in the development of theories that explain the link between brain function and memory, and in the development of cognitive neuropsychology, a branch of psychology that aims to understand how the structure and function of the brain relates to specific psychological processes. Before his death, he resided in a care institute located in Windsor Locks, Connecticut, where he was the subject of ongoing investigation. His brain now resides at UC San Diego where it was sliced into histological sections on December 4, 2009. Henry loved to do crossword puzzles, play bingo, watch TV, and socialize with the people who took care of him.