Jon Gray Remakes Blackstone Into Everybody’s Investing Megastore (1)

For a man who once fiercely kept a low profile, Jon Gray is everywhere.

Here is Blackstone Inc.’s president jogging in Munich, telling his 266,000-plus LinkedIn followers he’ll get a beer and pretzel. On a run in San Francisco, he cheers the city’s comeback. In a Central Park outing with an influencer in New York, he says he’s trying to put “a little bit of a human face to finance.”

TikTok-esque clips of a sweaty billionaire mixing travel musings with investment ideas and the occasional folksy platitude would once have seemed outrageous at a Wall Street firm built on ...