Everyone who comes to Los Angeles has a dream, they say. Before joining the White House communications team, Hicks worked on President Trump's 2016 presidential campaign.
It means she will supervise messaging at Mr Trump's favorite cable television network, the Rupert Murdoch-owned Fox News. A 22-year Fox News veteran and a loyal soldier to the late Roger Ailes, Shine had been with the organization since its launch.
Hicks, 29, is best known as one of President Donald Trump's most trusted aides.
Hicks graduated from SMU in 2010 and got her start with the Trump family in 2012 when Ivanka Trump needed public-relations help as she expanded her clothing line.
But communications executives cycling out of the White House and into high-profile positions at media companies is not unusual. The merger was approved in July, and Disney will gain Fox's film and TV studio assets, plus cable networks like FX and National Geographic in the $71 billion deal.
Hicks will be an executive vice-president and chief communications officer for Fox, the new company that will run Fox News, Fox Sports and Fox's broadcast networks. O'Brien was previously chief of staff for Democrats Joe Biden and Robert Menendez.