One of our Directors Aaron is somewhat of an amateur psychologist, with a growing interest in the field particularly from a behavioural science perspective.
There are many paths in to this diverse area dependent on your personal interests, but an area with immediate practical impact is marketing. The Choice Factory by Richard Shotton (https://www.goodreads.com/en/book/show/36796718-choice-factory) is an excellent introduction and thoroughly recommended.
This makes @rshotton an easy Twitter recommendation. You can find his profile here: https://twitter.com/rshotton