Acceptance and Commitment Therapy (ACT - pronounced "act") is a form of psychotherapy as well as general philosophy on living. It combines elements of Cognitive Behavioural Therapy with Buddhism, mindfulness and coaching practices.
Much of Brojo's ideas on Values and Valued Living are heavily based in ACT.
ACT has 6 core principles that are followed by therapists and patients/coaching clients alike;
A more intensive overview of these principles can be found here.
Harris is also the author of The Happiness Trap: How to Stop Struggling and Start Living, a popular book highly recommended by us here at Brojo, which applies ACT principles to living in a way that lets go of painful thought processes while embracing real life.
These resources show how BROJO uses ACT principles in our own works and methodology.
Dealing with Emotions - https://www.youtube.com/watch?v=Sv90oNvwYZg
Managing Negative Thoughts - https://www.youtube.com/watch?v=jyaNRFhQOGY
Dealing with the "I'm Not Good Enough" story - https://www.youtube.com/watch?v=bxIQ17xcYg0