Hedge fund titan Bill Ackman shares the secret that got him through his lowest moments 

• At a financial conference, billionaire Bill Ackman shared the life advice that he says got him through a tumultuous time in his life. Applying the principle of compounding interest to his personal life, he said he tried not to look back, because that will depress you, but instead tried to improve a little bit every day. 

Billionaire hedge fund manager Bill Ackman is known for his activist approach to investments—and, lately, to politics.

His personal life has been just as dramatic.