A prolific writer on time management, David Allen is best known for his method of “Getting Things Done.” Now in his golden years, he shows no signs of slowing down. He publishes new books and blog articles regularly, and he offers executive coaching and consulting via the David Allen Company.

Allen’s company also provides public seminars on his renowned methodology. His expertise comes from his personal experience in more than 35 different professions. Life has had its ups and downs for Allen: He developed his method of writing out and prioritizing small tasks to keep clarity and remove needless stress from everyday life.

After a struggle with heroin addiction that cost him everything, he found his way through spirituality. This self-help guru’s primary goal now is to keep his mind clear of obligations. Since a move overseas in 2014, Allen and his wife, Kathryn, continue to enjoy a stress-free yet productive life in Amsterdam.