Barack Obama is sworn in as the 44th President of the United States on January 20, 2009. Click through the gallery to see 100 moments of his reign.
The Obamas share a moment on a goods lift as they go to one of the opening balls on January 20, 2009. "It was pretty cool, so the president took off his tuxedo jacket and put it over his wife's shoulders," said White Photographer Pete Souza. "Then they had a half private moment when coworkers and intelligence agents tried not to look."
Obama wears 3D glasses during a Super Bowl showing at the White House on February 1, 2009.
Obama speaks on February 4, 2009 with staff at the Oval Office of the White House. From left, senior Advisor Pete Rouse, director of the Legislative White House, Phil Schiliro, senior advisor David Axelrod, director of National Economic Council Lawrence Summers and White House Chief of Staff Rahm Emanuel
A boy touches Obama's hair in the Oval Office on May 8, 2009. "A temporary White House employee, Carlton Philadelphia, brought his family to the Oval Office to take a farewell photo President Obama, "said photographer White House Pete Souza. "Carlton's son quietly told the president he had just had a haircut like President Obama and asked if he could feel the president's head to see if it felt the same way he did."
The President returns to the Oval Office on May 29, 2009 after traveling for staff and helpers at West Wing Hamburg.
Obama closes his eyes before capturing his weekly White House radio address on June 2, 2009.
Obama puts a flower in the Buchenwald Memorial when he visits the former concentration camp in Germany in June 5, 2009.
Obama stands on stage before he dies on October 26, 2009 in Jacksonville, Florida, making comments to its members. "Of all privileges As president, I have no greater honor than to serve as commander-in-chief," Obama said in his speech.
Obama salutes during the worthy transfer of Army Sgt. Dale R. Griffin on October 29, 2009. The President traveled to an Air Force base in Dover, Delaware, to board a plane with the bodies of 18 Americans killed in Afghanistan.
The President Lawrence Lipscomb, Chief of the Watchtower Division, on December 3, 2009 at the Eisenhower Executive Bureau.
The President is on the phone with a cellphone when he leaves from Marine One in Baltimore on January 29, 2010.
Obama calls a member of Congress to discuss health care reform on March 19, 2010. A bill was passed by the Senate in December 2009, but there was intense negotiation before it could happen to the House. The bill was passed after more than a year of fierce party-political debates over 219-212. All 178 Republicans resisted, along with 34 Democrats.
Obama will perform on May 31, 2010 on a rainy day outside of Chicago to hold a Memorial Day speech. "When the lightning started, intelligence told the president that it was too dangerous to go on," said White House photographer Pete Souza. He himself took the stage and informed the audience that his speech was canceled and that everyone should return to their buses for safety, and later he boarded some of the buses to thank them and apologized for his failure
Obama takes questions at the G-20 summit in Toronto on June 27, 2010. "We came to Toronto with three specific goals: to bring global (economic ) Boosting the recovery It is strong and enduring to further reform the financial system and address the range of global issues that affect our prosperity and our security, and we have made progress in each of these areas, "said Obama.
Obama is praying in the Oval Office with co-chairmen of the National Prayer Breakfast on January 27, 2011. From left are US Representative Heath Shuler, US Representative Tom Coburn, US Rep. Jeff Miller, Obama, former Arizona Rep. Ann Kirkpatrick and US Senator Mark Pryor.
The first family visits Christ the Redeemer in Rio de Janeiro on March 19, 2011. Obama visited Brazil, Chile and El Salvador during his trip to Latin America.
Obama and British Prime Minister David Cameron play with students on May 24, 2011 in London table tennis.
Obama speaks backstage with Senior Advisor Valerie Jarrett before a reception in Philadelphia on June 30, 2011.  100 Moments of Obama's Presidency
Obama does pushups on the White House basketball court after a member of Harlem Globetrotters shoots on April 9, 2012.
During an event on April 18, 2012, Obama looks out of the famous Rosa Parks Bus, which was restored by the Henry Ford Museum in Dearborn, Michigan. "I just sat there for a moment, thinking about the courage and stubbornness that's part of our recent history, but it's also part of that long line of people who are sometimes nameless, who often did not do the history books, but persisted on their dignity, their share of the American dream, "said the president.
Obama congratulates the cadets who received their diplomas from the US Air Force Academy on May 23, 2012.  100 Moments of Obama's Presidency
The Obama's occupy the Chicago skyline on June 15, 2012. The Obama lived in Chicago before he was president, and they still have a home there.
Obama claims to be trapped in the web by Spider-Man when he meets Nicholas Tamarin, 3, on October 26, 2012 in front of the Oval Office interacts. Nicholas, son of White House Advisor Nate Tamarin, had out-trick-or-treating ing. "The president told me that this was his favorite picture of the year when he saw it hanging in the west wing a few weeks later," said Pete Souza , Photographer in the White House.
Obama takes the oath of office during his swearing-in ceremony on January 21, 2013. He is the 17th president to win a second term.
Obama kisses his wife during the opening ceremony in Washington. Sasha, left, takes a picture of her sister Malia.
Obama and four former US presidents attend the inauguration of the George W. Bush Presidential Center Museum on April 25, 2013. From the left are Obama, Bush , Bill Clinton, George HW Bush, and Jimmy Carter
Obama looks to see if it's still raining at a White House press conference on May 16, 2013.
Obama takes a photo with a sleeping boy in the White House during a Father's Day Ice Cream Social on June 14, 2013.
Bo, one of Obama's dogs, hangs in the Oval Oval Office while the President begins his day on November 6, 2013. "Every morning, the President always walks through that door, not through the direct outside door to the Oval Office," said Pete Souza, a White House photographer. 19659003] 100 Moments of Obama's Presidency
Obama throws a football in the Oval Office on January 6, 2014
Obama works on February 19, 2014 aboard Air Force One.
Helpers laugh as the president hits a fly in the Oval Office on May 6, 2014.
Obama slips across a counter to pose with staff at a Shake Shack restaurant in Washington on May 16, 2014. Vice President Joe Biden, bottom right, did the same. "The president usually takes a group photo with restaurant staff when he's having lunch or dinner," said Pete Souza, a White House photographer.
Obama tries out a driving simulator on July 15, 2014, when he entered the Turner-Fairbank Highway Research Center in McLean, Virginia , touring. The simulator should demonstrate the kind of "smart" vehicles being developed at the center.
Obama Visits Stonehenge Next September 5, 2014. White House photographer Pete Souza recalls this day: "We were at the NATO summit in Wales when someone mentioned to the president that Stonehenge was not that far away." Let's go, "he said, so when the summit ended, we made a short detour on the way back to Air Force One."
Obama and Indian Prime Minister Narendra Modi visit on 30 September 2014 the Martin Luther King Memorial in Washington. 19659003] 100 Moments of Obama's Presidency
Obama hugs Ebola survivor Nina Pham on October 24, 2014 in the Oval Office. Pham, one of two Dallas nurses who were diagnosed with the virus, was released after treatment at a hospital in Ebola Bethesda, M Aryland. The other nurse, Amber Vinson, was treated in Atlanta and also declared Ebola-free
The President walks along the White House Colonnade on January 22, 2015.
Obama poses with the fastest man in the world, the Jamaican sprinter Usain Bolt, at an event in Kingston, Jamaica, on April 9, 2015.  100 Moments of Obama's Presidency
Obama's wave aligns with a rainbow as he heads aboard Air Force One in Kingston, Jamaica on April 9, 2015.
Obama says goodbye to House Minority Leader Nancy Pelosi from a West Wing corridor on April 29, 2015.
The President speaks at a White House event recognizing emerging global entrepreneurs on May 11, 2015.
On June 11, 2015, Obama takes a photo with the Washington Nationals' "Racing Presidents" team. The mascots competing at every home game of nationality represent former US presidents – from left, George Washington, Thomas Jefferson, William Howard Taft, Theodore Roosevelt, and Abraham Lincoln. "The President asked the Secret Service to stop the motorcade when he discovered the Racing Presidents," said Pete Souza, a White House photographer.
Obama greets the audience He arrived on July 26, 2015 in Nairobi, Kenya, and attended his father's homeland for the first time
Obama holds Ella Rhodes, daughter of Assistant National Security Advisor Ben Rhodes, on October 30, 2015 in the Oval Office. She was wearing an elephant costume for a White House Halloween event.
The President and First Lady meet R2-D2 and a stormtrooper for a screening of the new "Star Wars" film at the White House on December 18th 2015.
Obama is having lunch on March 15, 2016 during a luncheon on St Patrick's Day Irish Prime Minister Enda Kenny Past Parliament Speaker Paul Ryan
Obama, left, and First Lady Michelle Obama, right, tango with dancers at a state dinner in Buenos Aires on March 23, 2016.  100 Moments of Obama's Presidency
The Obama's read a book for children on March 28, 2016 at White's annual Easter Role n house. The Easter Egg Role has been a tradition of the White House since 1878, when President Rutherford B. Hayes allowed children to roll eggs on the South Lawn