Short answers, pulled from the story.
Andrew S. Zucker, an attorney in the entertainment industry, founded the Academy of Interactive Arts & Sciences in 1991. The organization began as a loose coalition rather than a formal non-profit entity.
The AIAS was formally reestablished on the 19th of November 1996 after video game industry leaders decided they wanted to reform the group into a dedicated non-profit organization for their sector. Peter Main of Nintendo backed this effort alongside Tom Kalinske of Sega and Doug Lowenstein, founder of the Entertainment Software Association.
The D.I.C.E. Summit launched in 2002 in Las Vegas, Nevada and has run annually since that initial year. Members Richard Hilleman and Lorne Lanning suggested creating the convention to provide financial stability around 2000.
Martin Rae implemented changes to the Summit including shorter talk times to give more attention to speakers and he also rebranded the awards as the D.I.C.E. Awards for the 2013 summit. Mike Fischer replaced Rae as president in 2016 following his tenure.
A keynote speaker was added to open the event in 2007 from Sony Pictures Entertainment while film directors began appearing as keynotes starting in 2008. Valve presidents appeared as speakers in both 2009 and 2013 and Activision Blizzard CEOs spoke at the event in 2010 and 2011 before CCP Games CEO took the stage in 2014 while Riot Games led discussions in 2015.