Jamie Dimon

Dimon's JPMorgan Chase letters are long, sometimes very long, but they are organised and specific: capital, risk, each business line, then his views on regulation and the economy. The letter after the 2012 London Whale trading loss addressed it head-on, accepting blame and setting out which risk controls had failed and what changed. The policy sections can read as lobbying, so separate the explanation of the bank from the advocacy.