Question: When was the conference for which Robert Leslie was chief photographer founded?

Context paragraphs:
Leslie Harrison: Robert Leslie "Leslie" Harrison (9 May 1903 – 15 April 1966) was a dairy farmer and member of the Queensland Legislative Assembly.

Kevin Frayer: Kevin Frayer (born 1973) is a Canadian photojournalist noted for his wartime work in the Middle East including the Gaza Strip, Lebanon, and Afghanistan.  He started his career in 1991 at the Winnipeg Sun and later as a National Photographer for the Canadian Press .  From 2003-2009 he was based in the Middle East for the Associated Press and later in New Delhi as Chief Photographer for South Asia.

Robert Leslie (photographer): Robert Leslie is a photographer from London.  He was the chief photographer for TED and the World Science Festival.  One of his major works involved two road trips, one in 2009 and the other in 2011, across the Sun belt, documenting what he saw and the changes that occurred between the two journeys.

TED (conference): TED (Technology, Entertainment, Design) is a media organization which posts talks online for free distribution, under the slogan "ideas worth spreading".  TED was founded in February 1984 as a conference, which has been held annually since 1990.  TED's early emphasis was technology and design, consistent with its Silicon Valley origins, but it has since broadened its focus to include talks on many scientific, cultural, and academic topics.

Z for Zachariah: Z for Zachariah is a post-apocalyptic science-fiction novel by Robert C. O'Brien that was published posthumously in 1974.  The name Robert C. O'Brien was the pen name used by Robert Leslie Conly.  After the author's death in 1973, his wife Sally M. Conly and daughter Jane Leslie Conly completed the book guided by his notes.  Set in the United States, the story is in the form of a diary written from the first-person perspective of sixteen-year-old Ann Burden, who has survived a nuclear war and nerve gas through living in a small valley with a self-contained weather system.

Leslie Harrison Dam: The Leslie Harrison Dam is an earth-fill embankment dam with a vertical lift gated spillway across the Tingalpa Creek that is located in the South East region of Queensland, Australia.  The main purpose of the dam is for potable water supply of the Redland City in Brisbane.  The impounded reservoir is called Tingalpa Reservoir.  The dam was named after Robert Leslie Harrison, a Queensland parliamentarian who died in April 1966.

Murad Sezer: Murad Sezer (born 1969 in Germany) is a Turkish photographer.  He moved to Istanbul as a child.  He has a journalism B.A. from the Istanbul University and he built a career as a sports photographer in the Turkish media 10 years before he joined Associated Press in 1996.  He was part of Associated Press team that have won the Pulitzer Prize for Breaking News Photography in 2005 with his photo of US Marines praying over a Marine killed while fighting insurgent strongholds in Fallujah (other people from the team were Bilal Hussein, Karim Kadim, Brennan Linsley, Jim MacMillan, Samir Mizban, Khalid Mohammed, John B. Moore, Muhammad Muheisen, Anja Niedringhaus and Mohammed Uraibi).  In April 2009 he joined Reuters News as chief photographer for Turkey.

Muhammed Muheisen: Muhammed Muheisen is a two-time Pulitzer Prize winning photographer and the Chief Photographer for the Middle East, Afghanistan and Pakistan for the Associated Press.

Robert C. O'Brien (author): Robert Leslie Carroll Conly (January 11, 1918 – March 5, 1973), better known by pen name Robert C. O'Brien, was an American novelist and a journalist for "National Geographic Magazine".

A Report from Group 17: A Report from Group 17, published in 1972, is a science-fiction thriller written by Robert Leslie Conly under his pen name Robert C. O'Brien.  Set in Washington, D.C., during the Cold War, the story deals particularly with the danger of developing bioweapons.  The potential cause of conflict is a resurgence of Nazism in Europe.  A 12-year-old girl who lives near a Soviet estate in Maryland becomes a victim of intrigue when she is kidnapped for use as an experimental subject.  Themes include the threat of modern war to human survival, the moral responsibility of scientists, and the importance of both individual freedom and sympathetic instincts.  Following two novels for children, "A Report from Group 17" was the first of two dystopian novels that O'Brien wrote for adults.  His last novel, "Z for Zachariah" (1974), depicts a conflict between two survivors of a nuclear war and deals with similar themes.

Supporting paragraphs: Robert Leslie (photographer) TED (conference)
Answer: February 1984