Antony Blinken: Secretary of State

Joe Biden nominated his longtime adviser Antony Blinken to be secretary of state. Blinken, 58, served as deputy secretary of state and deputy national security adviser during the Obama administration and has close ties with Biden. He is widely viewed as a pragmatic centrist on foreign policy who has supported past American interventions and is well respected by some Republicans.

Alejandro Mayorkas: Homeland Security

Biden announced the nomination of Alejandro Mayorkas, who served under Barack Obama as deputy secretary of Homeland Security and director of the Citizenship and Immigration Services. If confirmed by the Senate, Mayorkas, who turns 61 on Tuesday, would be the first Hispanic, and immigrant, to lead DHS. Born in Havana, Cuba, Mayorkas came to the United States as a political refugee with his family when he was a child.

Avril Haines: Director of National Intelligence

Haines, 51, was the first woman to serve as Deputy Director of the CIA, a position she held from 2013 to 2015. If confirmed, she will be the first woman to oversee the 17 agencies that make up the nation's intelligence community. Biden's team are also vetting Representative Deb Haaland for the interior Secretary Post. She'd be the first Native American cabinet secretary.

Janet Yellen: Treasury Secretary

Biden has chosen former Federal Reserve Chair Janet Yellen to serve as treasury secretary, a pivotal role in which she would help shape and direct his economic policies at a perilous time, according to a person familiar with the transition plans. Yellen, who is widely admired in the financial world, would be the first woman to lead the Treasury Department.

Linda Thomas-Greenfield: Ambassador to the UN

Joe Biden's pick to be the next US ambassador to the United Nations, if confirmed by the Senate, would be the most experienced diplomat of the six people named by Biden for top national security positions on Monday.  Linda Thomas-Greenfield is a 35-year veteran of the State Department who served as ambassador to Liberia, director general of the foreign service and top diplomat for Africa before being forced out during the early months of the Trump administration. Biden plans to elevate the position of UN ambassador to Cabinet level.

John Kerry: Climate Envoy

John Kerry, one of the leading architects of the Paris climate agreement, is getting one more chance to lead the fight against climate change after Biden named the former secretary of state as climate envoy for national security. It's a sign of how the incoming administration is heeding warnings that natural disasters from global warming will weaken US defense and spur conflicts around the globe. Unlike others, this role doesn't need Senate confirmation.

Jake Sullivan: National Security Adviser

Biden will appoint Jake Sullivan to be his national security adviser. Sullivan, who at 43 will be one of the youngest national security advisers in history, was a top aide to former secretary of state Hillary Clinton before becoming then-vice president Biden's national security adviser.