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Actioneer is a software development company founded in San Francisco by David Allen, Russell Bishop and Tom Hagan with an initial investment of $12M in 1994 that developed a software product with Russell Bishop and David Allen originally for use with the MAP seminar offered by Productivity Development Group and later for GTD.
More recently the concept was re-introduced to popular culture through various self-help books as Pam Young and Peggy Jones' 1977 book Sidetracked Home Executives: From Pig-Pen to Paradise, FlyLady Marla Ciley, Chris Crouch's book Getting Organized, David Allen's 2002 book Getting Things Done and Merlin Mann's website 43 Folders, whose name comes from one popular method for maintaining a tickler file.