List of Famous people who died at 84

Peter Pitirimovich Sorokin was an American Russian physicist and co-inventor of the dye laser. He was born in Boston and grew up in Winchester, Massachusetts. He attended Harvard University, receiving a BA degree in 1952 and a PhD in Applied Physics in 1958; his PhD thesis adviser was Nicolaas Bloembergen.

Prince Michael Feodorovich Romanoff was a French filmmaker. A descendant of the Russian Emperors, he was a great nephew of the last Russian Tsar, Nicholas II.

Jerome Martin "Jerry" Haynes was an American actor from Dallas, Texas. He is most well known as Mr. Peppermint, a role he played for 30 years as the host of one of the longest-running local children's shows in television, the Dallas-based Mr. Peppermint (1961–1969), which was retitled Peppermint Place for its second run (1975–1996). He also had a long career in local and regional theater and appeared in more than 50 films. A 1944 graduate of Dallas' Woodrow Wilson High School, he was the father of Butthole Surfers frontman Gibby Haynes.

Károly Simonyi was a Hungarian physicist and writer. He was professor of electrical engineering at Technical University of Budapest and the author of the popular tabletop book A Cultural History of Physics. He is the father of Charles Simonyi, a prominent computer-software executive who oversaw the creation of Microsoft Office.

Patrick John Hillery was an Irish Fianna Fáil politician who served as the sixth President of Ireland from December 1976 to December 1990. He also served as Vice-President of the European Commission and European Commissioner for Social Affairs from 1973 to 1976, Minister for External Affairs from 1969 to 1973, Minister for Labour from 1966 to 1969, Minister for Industry and Commerce from 1965 to 1969 and Minister for Education from 1959 to 1965. He served as a Teachta Dála (TD) for the Clare constituency from 1951 to 1973.

William Collier Jr. was an American stage performer, producer, and a film actor who in the silent and sound eras was cast in no less than 89 motion pictures.

Margaret St. Clair was an American fantasy and science fiction writer, who also wrote under the pseudonyms Idris Seabright and Wilton Hazzard.

Willy Eisenschitz was a French painter of Austrian origin who mostly represented the landscapes of Provence and Drome in particular. His works are presented in a dozen European museums, and are the subject of retrospective exhibitions from 1957 to 2006.

Grace Evelyn Pickford was an American biologist and endocrinologist, known for "devising ingenious instruments and techniques" and her work on the hematology and endocrinology of fishes.

Lucyna Winnicka was a Polish actress. She appeared in 21 films between 1954 and 1978. She played the lead role in the film Mother Joan of the Angels, which won the Special Jury Prize at the 1961 Cannes Film Festival. In 1967 she was a member of the jury of the 5th Moscow International Film Festival.