When an index fund changes managers

The long-time lead manager of an S&P 500 index mutual fund I own shares in just left the fund, replaced by a relative rookie in the business. Should I worry?

Probably not. An index fund manager deals with a basket of securities that doesn't change often, so the manager's departure isn't apt to have a great impact on the fund's performance. If the fund were an actively managed offering that relied heavily on research and proven stock-picking ability, you'd have more cause.