Langer's first published work appeared in 1991 as the written materials for a 4-1/2 day course offered by the Institute of Internal Auditors. After writing other training materials for that organization, she was hired as a ghostwriter for four chapters of a John Dvorak book called Dvorak's Inside Track to the Mac (1991). She partnered with Dvorak co-author Bernard J. David to co-author The Mac Shareware Emporium (1992). From that point forward, she worked mostly alone on dozens of computer how-to books for beginning to intermediate users. Her publishers include Peachpit Press, McGraw-Hill, and Macmillan.

Starting in the early 1990s, Langer authored numerous articles about using computers for a wide range of print and Web-based publications.