instruction:
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].
question:
After enduring one too many maddeningly slow boarding experiences  Jason Steffen a professor of physics and astronomy at the University of Nevada Las Vegas  began digging into the unexpectedly complicated mechanics of efficiently ushering passengers onto planes.
In 2008   Steffen  created a computer simulation to evaluate existing boarding methods and ultimately design what  he  claims is the most efficient option for getting restless passengers into their seats. The results were published several years ago in the Journal of Air Transport Management (summarized here).
In  his  research   Steffen  identified the two most common factors responsible for slowing the boarding process to a painful crawl:
In fact  the most routine boarding process â from back to front â is actually the slowest of them all   Steffen âs argues  Itâs even less efficient than boarding a plane in a completely random order.
 Steffen  claims that  his  proposed method  which minimizes the former issue and eliminates the latter  could significantly reduce boarding times  thus cutting down on overall door-to-door flight lengths  and ultimately saving airlines hundreds of millions of dollars a year.
answer:
Jason Steffen


question:
LONDON (AP) — A British judge is set to decide Tuesday whether to quash or uphold an arrest warrant for  WikiLeaks founder Julian Assange  who has spent more than five years evading the law inside Ecuador's London embassy .
 Assange 's lawyers argue that it's no longer in the public interest to arrest him for jumping bail in 2012 and seeking shelter in the embassy to avoid extradition to Sweden  where prosecutors were investigating allegations of sexual assault and rape made by two women. He denied the allegations.
Swedish prosecutors dropped their investigation last year  saying there was no prospect of bringing  Assange  to Sweden in the foreseeable future. But the British warrant for violating bail conditions still stands  and  Assange  faces arrest if  he  leaves the embassy.
 Assange 's lawyers asked for the warrant to be withdrawn since Sweden no longer wants  him  extradited  but  the judge  rejected their request last week.
 Assange 's attorney went on to argue that arresting  him  is no longer proportionate or in the public interest. Lawyer Mark Summers said that the 5½ years  Assange  has spent inside the embassy were "adequate  if not severe" punishment for his actions  and cited a report by a U.N. committee which said the 46-year-old was being arbitrarily detained.
He said the fact remained that  Assange  had chosen to enter the embassy to avoid arrest 
Even if the judge lifts the British arrest warrant   Assange 's legal problems may not be over. He suspects there is a secret U.S. grand jury indictment against him for WikiLeaks' publication of classified documents  and that American authorities will seek his extradition
answer:
Julian Assange


question:
MAKE AMERICA GREAT AGAIN! pic.twitter.com/64a93S07s7  â Donald J. Trump (@realDonaldTrump) December 8  2017
 While this is an improvement over some of  his  earlier approval ratings  which have cratered as low as 33 percent  45 percent still isn't all that great. It's still less than half of the country  and Trump still has very high disapproval rates. According to The Hill  more than half of Americans say they disapprove of the job Trump is doing.
This is  his  funniest tweet ever [Link] â Allahpundit (@allahpundit) December 8  2017
Next year  he âs going to be tweeting out polls from Rasmussen that have  him  at 38% when the rest of the field has  him  at 31 [Link] â Allahpundit (@allahpundit) December 8  2017
answer:

Donald J. Trump