Robin McLaurin Williams (July 21, 1951 – August 11, 2014) was an American actor and comedian. Known for his improvisational skills and the wide variety of characters he created on the spur of the moment and portrayed on film, in dramas and comedies alike, he is regarded as one of the greatest comedians of all time. He received numerous accolades including an Academy Award, two Primetime Emmy Awards, six Golden Globe Awards, two Screen Actors Guild Awards, and five Grammy Awards.

Williams began performing stand-up comedy in San Francisco and Los Angeles during the mid-1970s, and released several comedy albums including Reality ... What a Concept in 1980. He rose to fame playing the alien Mork in the ABC sitcom Mork & Mindy (1978–1982). He received his first leading film role in Popeye (1980). Williams went on to win the Academy Award for Best Supporting Actor for Good Will Hunting (1997). His other Oscar-nominated roles were for Good Morning, Vietnam (1987), Dead Poets Society (1989), and The Fisher King (1991).

Williams starred in the critically acclaimed dramas The World According to Garp (1982), Moscow on the Hudson (1984), Dead Poet's Society (1989), Awakenings (1990), Patch Adams (1998), One Hour Photo (2002), and World's Greatest Dad (2009). He also starred in family films such as Hook (1991), Mrs. Doubtfire (1993), Jumanji (1995), Jack (1996), Flubber (1997), RV (2006), and the Night at the Museum trilogy (2006–2014). He lent his voice to the animated films Aladdin (1992), Robots (2005), Happy Feet (2006), and its 2011 sequel.

After suffering for many years from depression, paranoia, memory loss and insomnia, Williams died by suicide at his home in Paradise Cay, California on August 11, 2014. He was 63 years old. His autopsy revealed that undiagnosed and severe Lewy body disease had spread widely in his brain. His illness and death sparked debate over the conflation of psychology with neurology.