Maureen Johnson

Maureen Johnson is an American young adult author known for novels including 13 Little Blue Envelopes and the Truly Devious mystery series, as well as her contributions to the Shadowhunter short fiction anthologies within Cassandra Clare's Shadowhunter Chronicles universe. Johnson was among the authors Clare invited to write original short stories expanding side characters and historical periods within the Shadowhunter world, published across several companion story collections that supplement the main novel series. Beyond her contribution to Clare's universe, Johnson has an extensive independent career spanning contemporary YA fiction, mystery, and humor writing, and has been active in YA publishing advocacy and online author communities for years. Her Shadowhunter contributions reflect a broader pattern in the franchise of drawing established YA authors into the universe for shorter, more experimental pieces outside the constraints of the main series' continuity. Johnson continues to publish her own acclaimed YA fiction, including ongoing entries in the Truly Devious series, alongside occasional collaborative and anthology work such as her Shadowhunter contributions.