SAN FRANCISCO — Jamie Dimon, chairman/CEO of JPMorgan Chase, the country's largest bank by assets, says he tells his kids to "react to reality quickly." He offered the same advice to CEOs attending the 32nd annual J.P. Morgan Healthcare Conference in San Francisco this week. Dimon is well-versed in dealing with business crises, particularly in light of his bank's involvement in Bernard Madoff's Ponzi scheme.