This is a recent interview by neuroscientist Rick Hanson with his teacher, Joseph Goldstein, who is one of the founding teachers of the Insight Meditation Society in Barre, Massachusetts.
Joseph gives a very clear explanation of the full range of what mindfulness is, and also what it isn’t, based on his forty years experience of teaching vipassana in the West.
The interview is freely offered by Rick Hanson, but you need to sign up to get access to it:
Jill Shepherd: insight meditation 