After decades of in-the-field research and practical application of his productivity methods, David wrote the international bestseller Getting Things Done, a book that has since been published in over 28 languages and recognized by TIME magazine as the defining self-help business book of its era.

In 2015, he released an updated edition featuring new insights, updates, and discoveries about the GTD methodology and its many personal and professional applications, reflecting how the system has continued to evolve alongside the way people work.

Today, David Allen is widely considered the leading authority in organizational and personal productivity. The David Allen Company, run by David and his wife Kathryn, oversees the certification academy and quality standards for Global Partners offering Getting Things Done courses and coaching around the world, ensuring the integrity of the methodology across every market it reaches.