Jonathan Bricker: The Secret to Self Control
Jonathan Bricker is a researcher on behavioural change. His work shows that discipline alone is not enough to induce changes on negative behaviours or habits. Instead, having a strategy based on acceptance and commitment allows for much better chance of success in permanent behavioural changes.
For traders who have impulsive behaviour like over trading and deviation from their trading plan during trading, it is a good introduction on what is necessary to correct the behaviour.