Google Scholar data ranked Steven C. Hayes among the top 1,500 most cited scholars on the planet, in all areas of study, living and dead.  He is the founder of Acceptance and Commitment Therapy (ACT) which brings in mindfulness, acceptance and value based methods to relieve human suffering.  I enjoyed and recommend his most recent book “A Liberated Mind: How to Pivot Toward What Matters.”   Learn more about him at stevenchayes.com.  May you enjoy the wisdom of Steven C. Hayes as much as I did!