Ajahn Sumedho is a Buddhist Monk trained in the Thai Forest Tradition of Theravada Buddhism. He is a follower of Ajahn Chah who taught many Westerners.
This book is a real treat. I have done extensive reading on Buddhism, particularly the Theravada tradition. Ajahn Chah started many monasteries and those who followed him, Ajahn Sumedho, Ajahn Amaro, Jack Kornfield, and many others, all seem to offer such wisdom in presenting the Dharma. Their way of teaching, to me, is very direct and practical. Not high in the head thinking, but real, basic, and very applicable to my life. (Isn't that what we all want?)
I read through this short book in just a few days and enjoyed it so much I've started rereading it again! If you are new to Buddhism, this is a great place to start, if you are an 'old pro' you'll enjoy this one too!