A looming battle of wits—and perhaps of ballots—between the world’s richest man and the most powerful political leader promises to be epic.

“There is no HHS expectation that HHS employees respond to OPM and there is no impact to your employment with the agency if ...

Headlines in 1999 speculated that Bill Gates might become the world's first trillionaire. But today, with much of his fortune pledged to philanthropy, another name is dominating that conversation — ...