Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].

Q: NBC will broadcast the Ceremonies again in prime time tonight  at 8 p.m. Eastern. This version will have commentary from hosts Katie Couric  who was tapped to place Matt Lauer after his firing  and Mike Tirico  who replaced  Bob Costas  as NBC’s prime-time host after a nearly three-decade run.
Tirico made his prime-time debut Thursday night. The Washington Post’s Rick Maese caught up with him before the Games to learn more about his new high-profile assignment. “I think trying to be  Bob  would be stupid. And that was one of  his  bits of advice: Be yourself ” Tirico said. “So I’m going to try to do that.” For the full Q&A  scroll down to the “Olympics Corner” section of this newsletter.
For 11 straight Summer and Winter Games — dating back to 1992 —  Bob Costas  served as the familiar and reliable face of the Olympics. But  Costas  is sitting out the PyeongChang Games and has passed the torch to Tirico  who will serve as NBC’s prime-time host  starting with Friday’s Opening Ceremonies. Tirico joined the network in 2016 after more than two decades at ESPN and was a daytime host of the Rio Games. He recently spoke with The Washington Post’s Rick Maese about his new high-profile assignment.
Q: It’s not like you’re a newcomer to this broadcasting game  but did you seek out  Costas  for any advice?
A: There’s been a longtime friendship there. I don’t think that’s overstating it. And I can’t imagine this job changing hands more smoothly.  Bob  has been unbelievable in making  himself  available  if I have any questions. I know I can pick up the phone during the Games  and if I have a question  I know I’ll get an honest answer.  Bob ’s the all-time best.  Bob  set a standard for the amount of times  he  did this and the way  he  did it that likely won’t be matched ever again. So I’m not replacing  him ; I’m following  him . I think trying to be  Bob  would be stupid. And that was one of  his  bits of advice: Be yourself. So I’m going to try to do that.
 Bob Costas  served as NBC’s prime time host for 11 straight Olympics  but has passed the torch to Mike Tirico for the PyeongChang Games. (Courtesy photo/NBC Sports)
A: The best piece of advice that I got from  Bob  and from Al [Michaels] before the Rio Games working daytime: You don’t have to know everything about everyone. It’s impossible. The experts at each sport have that covered. In the host role  you just need to have the overriding story lines. I’m trying to get to the top of the surface. It’s like one of those fancy Starbucks drinks — you do want to get some of the coffee  but you want to make sure you get all foam. But how has my life changed? I’m sitting in my office right now. Two years ago  I certainly would be watching a replay of a Big Ten or an NBA game from the night before. And right now I’m watching the women’s skeleton competition from Germany. And it’s the fourth different Olympic event that I’ve watched since I’ve been up this morning.

A: Bob Costas
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Q: These American billionaires also share a few quirks: Microsoft founder Bill Gates  Facebook CEO Mark Zuckerberg   Oracle founder Larry Ellison  dropped out of college. Jeff Bezos  Larry Page and Sergey Brin all went to Montessori schools  where children are encouraged to think independently and creatively rather than following traditional rules. It seems  too  that billionaires really like houses in Hawaii.
As is the case with the richest women in America  the richest people in America donate a lot of money to causes they care about. Some of the men on this list have donated hundreds of millions into research designed to improve human lifespan and eradicate dangerous diseases  such as Alzheimerâs disease and cancer. Warren Buffett  Gates  Zuckerberg  and  Ellison  have gone a step further and promised to give their fortunes away as part of The Giving Pledge  an initiative designed by Buffett and Gates to encourage billionaires to funnel their vast wealth to philanthropy.
6.  Larry Ellison
Oracle CEO Larry Ellison  speaks during an event at the company's headquarters in Redwood City  Calif. in 2014 David Paul Morris-Bloomberg via Getty Images
 Ellison   73 â another college dropout â co-founded the software firm Oracle in 1977. In addition to owning about 25% of the company  he also owns the entire Hawaiian island of Lanai  a sailing team and even an entire tennis tournament  the New York Times reports.
While known for living large (the billionaire owns a 288-foot yatch)   Ellison  started out with modest ambitions.  His  parents  who adopted  him  when  he  was nine months old  wanted  him  to be a doctor  but  he  left school when  he  realized medicine didnât interest  him .  He  moved to California and worked as a computer programmer and a rock-climbing instructor and river guide  according to the Times. At this point   Ellison  said  he  was âpretty happy with  his  life.â
But after a series of jobs   he  became part of a company working to establish a new type of software database. That company would become Oracle  now one of the largest software companies in the world.
 Ellison   like other titans on this list  is interested in extending human lifespan  and has given over $330 million for research into aging and related diseases.
Four-times divorced   Ellison  has two adult children and calls  his  $70 million Woodside  Calif. estate home. However   Ellison âs massive real estate portfolio means  he  never spends much time in one place.  He  owns additional properties in Japan  San Francisco  Malibu  Lake Tahoe and Rhode Island.

A: Larry Ellison
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Q: Lewandowski  and Deputy White House Chief of Staff Rick Dearbonâs interviews with the House Intelligence Committee come after ex-White House chief strategist Steve Bannon met with congressional investigators for almost 12 hours on Tuesday.
 Lewandowski  said on Fox Business Network's "Mornings with Maria" Wednesday that  he  was not instructed by the White House to withhold any information.
"I'll tell you anything "  Lewandowski  said.
 Lewandowski  who led the Trump campaign for almost two years through the Republican primaries   said they welcomed the âopportunityâ to testify before the committee.
âSteve was [with the campaign] for a short period of time. I was there almost two years  every day next to the candidate  next to President Trump â  Lewandowski  said on Fox News Channel's âOutnumbered Overtimeâ Tuesday. âNever  ever  ever did we coordinate or cooperate or collude with any Russians.â
 Lewandowski  told Fox News that  he  would âanswer every question truthfully  honestly  to the best of my ability and the best of my recollection.â
âBut because I have nothing to hide  Iâm looking forward to this opportunity help finally bring this to a close â  he  said.
 Lewandowski  added that  he  hopes Democrats come to a ârealizationâ that there was no Trump-Russia collusion.

A:
Corey Lewandowski
****