McGrann has worked as a reviewer for the Times Literary Supplement and as a contributing editor for The Paris Review. She has also had poems published in various literary magazines including TriQuarterly and Arion. She is a London Editor of A Public Space, a quarterly literary magazine, founded in 2005 by Brigid Hughes, former Executive Editor of The Paris Review.
Her first novel, 360 Flip, looked at the tensions lying below the surface of the "American Dream" in a 60s Levittown-style suburb, through the eyes of a disillusioned young poet growing up there in the 1950s. It was dedicated to her husband.
Exurbia, McGrann's second novel, set in Los Angeles in the mid 80s during the Reagan era, is about the mentally ill living in the margins of society. It follows an insecure thirteen-year-old woman suffering from bipolar disorder, Lise, and the parallel story of Ed Valencia, as their lives become entangled with the violent world of L.A.'s homeless gangs. It was dedicated to her parents.
- 360 Flip (2004)
- Exurbia (2007)
- From Less Than Spring, a long poem of conditions. (1999)
- Hermaphroditus (2002)
- "Class Notes 2000". Skidmore Scope Magazine. 2000-08-01. Retrieved 2007-06-16.
- "Into the Light". MOJO. 2003-08-01. Retrieved 2007-06-17.
- McGrann, Molly (1999-09-22). "From Less Than Spring, a long poem of conditions". TriQuarterly. Archived from the original on 2011-05-16. Retrieved 2007-06-20.
- McGrann, Molly (2002-04-01). "Hermaphroditus". Arion. Archived from the original on 2007-07-11. Retrieved 2007-06-20.
- "Masthead". A Public Space. 2005-12-16. Archived from the original on 2007-06-11. Retrieved 2007-06-18.
- McGrann, Molly (2004-06-16). "360 Flip". Picador. p. 192.
- McGrann, Molly (2007-02-17). "Exurbia". Picador. p. 300.