Who is billionaire Bill Ackman? Ackman is a prominent investing activist: When he considers that a company in which he has invested has underperformed, he urges the board and mana

Fast forward half a century, Bill Ackman, the billionaire hedge fund manager behind Pershing Square Capital Management, is looking to replicate Buffett’s success by creating a “modern-day Berkshire Hathaway.

In a post prior to the announcement, Ackman likened his firm's move to the approach Warren Buffett has used with Berkshire (BRK-A, BRK-B), in which Buffett turned a textile manufa