David Allen's *Getting Things Done* has sold over 2 million copies and is …

 Tiago Forte's PARA Method — Projects, Areas, Resources, Archive — is the most …

 Niklas Luhmann wrote 70 books and 400 academic papers using a system …

 Ryder Carroll's Bullet Journal is the most successful analog productivity system …

 Jim Benson and Tonianne DeMaria popularized Personal Kanban with their 2011 book of …

 Merlin Mann's 2007 Google Tech Talk on Inbox Zero went …

 Cal Newport's *Deep Work* (2016) and *A World Without Email* …

 James Clear's *Atomic Habits* (2018) sold more copies than almost …

 Francesco Cirillo invented the Pomodoro Technique in the late 1980s using a …

 Cal Newport (again — he's the dominant voice in this category) …