David Allen is a renowned productivity consultant and author of the best-selling book "Getting Things Done". In this book, he outlines his revolutionary approach to personal organization and productivity, which has been adopted by millions of people around the world. Through his workshops, seminars, and books, David Allen
From Wikipedia
Getting Things Done (GTD) is a personal productivity system developed by David Allen and published in a book of the same name. GTD is described as a time management system. Allen states "there is an inverse relationship between things on your mind and those things getting done".