The US presidential candidate has a reputation for being a formidable leader, a master of the media and a master at persuasion.
And he’s also got a history of making a lot of enemies.
Mr Obama, a white man, is famous for having the world’s longest-serving US president in office.
But he’s often had his share of detractors, and he’s had to deal with a number of controversies over his time in office, including allegations of racism and his use of the term “superpredator”.
Here are the 10 most influential professions in America.
Professional football player and coach The former San Francisco 49ers quarterback, who is now the president of the US Football League, has a knack for making people happy and for bringing about change.
He’s won two Super Bowls, one with the Indianapolis Colts and one with New England Patriots, and has been an NFL Hall of Famer.
He is the current president of USA Football.
Director and producer of the hit comedy series, Arrested Development (2006-2009) Mr Arrested is the name of the TV show based on a children’s book of the same name that he co-created.
The show has been on the air for eight seasons, has garnered over 200 million viewers, and is currently in its third season.
Mr Arresty was born in Miami, Florida, to a family of immigrants who came to America as children.
He grew up in Brooklyn, New York, before moving to the US in the late 1980s, when he attended the University of Miami.
He graduated with a degree in business administration in 1997, and worked in the advertising and media industry until 2004, when, after moving back to Miami, he joined NBC as a reporter.
Mr Trump, a successful real estate developer, has used his own money to pay for legal fees to defend his name against various lawsuits.
He has also tried to take advantage of Mr Obama’s status as a US citizen to become a political commentator.
Founder of the National Institutes of Health (NIH) Dr Anthony Fauci is the chairman of the agency that funds the research that the US government uses to develop treatments and cures for cancer.
The NIH is the largest independent agency of its kind in the US, and Mr Fauco is the only member of its governing board to hold a PhD in neuroscience.
He became a billionaire thanks to a 2011 fundraising effort that allowed him to buy up large stakes in pharmaceutical companies, and now is the biggest shareholder in the American Cancer Society (ACS), which is the world body for the treatment of breast cancer.
Owner of the San Francisco Giants baseball team and San Francisco Zoo Mr Trump has called for the closing of the NFL’s stadium in San Francisco and the relocation of the entire San Francisco-Oakland-Alameda County (SF-OAC) baseball team to a stadium in the state of Washington.
He also wants the NBA and NFL to merge into one entity.
Mr Fausci was an entrepreneur who has been involved in some of the largest tech companies in the world, including Facebook and eBay.
He bought out Facebook in 2016 for $1bn and has since launched a company called Faucom, which has a number the names of the world oceans.
Founder and CEO of a medical equipment company The US is home to some of Europe’s biggest hospitals, and in recent years, it has become increasingly difficult for people to access the medicines they need to survive.
Mr Mr Trump’s company, which he acquired in 2000, has been in the news recently for allegedly being too expensive for people.
In an interview with the New York Times in April, Mr Trump said he would like to see the prices of his medical equipment rise.
The prices of the medical equipment he sells are a lot higher than what we pay.
He could double the price of it, and if he did that, we could get that much better medicine.
Founder, co-founder and CEO, of a US-based health care company In 2005, Mr Fosci founded a health care technology company called MedicalX that was acquired by Medi-Cal in 2010 for $15bn.
He says that Medi’s technology has helped save people’s lives.
President of the American Medical Association (AMA) Mr Trump is the president and chief executive of the AMA, a professional association that represents more than 3 million doctors and medical professionals in the United States.
He was born and raised in New York and attended the prestigious Wharton School of the University in Pennsylvania.
The AMA has traditionally been considered a progressive organisation, with some conservatives arguing that the group’s president should be elected to the White House rather than appointed.
But Mr Trump and his advisers have repeatedly argued that the AMA is an establishment institution and that it is not interested in the needs of the everyday patient.
CEO and chairman of an investment