[2] Six of Levithan's books have won or been finalists for the Lambda Literary Award for Children's and Young Adult Literature, making him the most celebrated author in the category.

[4] At nineteen, Levithan received an internship at Scholastic Corporation where he began working on The Baby-Sitters Club series.

Levithan is also the founding editor of PUSH, a young-adult imprint of Scholastic Press focusing on new voices and new authors.

[5] In an interview with Barnes & Noble, Levithan said that he learned how to write books that were both funny and touching from Judith Viorst's Alexander and the Terrible, Horrible, No Good, Very Bad Day.

His first collaboration with Rachel Cohn, Nick and Norah's Infinite Playlist, was published in 2006 and adapted for the big screen in 2008.