When MrBeast and Mark Rober were on TODAY last week talking about their new project getting clean water to millions of people ...

While appearing on TODAY last week, MrBeast challenged Ken Griffin, CEO of the hedge fund Citadel, for a donation to his philanthropic campaign, Team Water. Griffin heard the call and answered. TODAY ...

Billionaire Ken Griffin's investing acumen has turned Citadel LLC into the world's most profitable hedge fund, but he's not ...

Billionaire investor Ken Griffin is placing a major bet on a company that's far outperformed expectations this year.

The gift will support the under-construction Braman Comprehensive Cancer Center in Miami Beach and a freestanding Emergency ...

Not even a billionaire and Palm Beach's largest property owner Ken Griffin can build a fence without permission from the town ...

Billionaire philanthropist and Citadel CEO Ken Griffin has donated $15 million to Mount Sinai Medical Center to help expand cancer research and treatment in Miami Beach and Hialeah.

Griffin, Palm Beach's largest property owner, requested the taller fence because of the natural grade on his estate's north property line.

From a $1 billion mega-mansion in Palm Beach to a London estate once linked to MI6, here’s a closer look at the homes of Citadel founder Ken Griffin.

Griffin, Palm Beach's largest property owner, requested the taller fence because of the natural grade on his estate's north property line.

United flight with over 200 passengers declares 'mayday' with engine failure after takeoff from D.C. 4 people who have seen the Epstein files say nothing suggests he was a spy ...