Cousin of actress/production manager Chantal Lonergan and production manager Valerie Lonergan.
His comedy, Lobby Hero, was performed at the Donmar Warehouse and New Ambassador's Theatre, was nominated for a 2003 Laurence Olivier Theatre Award for Best New Comedy of 2002.
Earned an M.F.A. in Dramatic Writing for New York University's Tish School of Arts.
Nominated for the 2001 Pulitzer Prize for Drama for the play "The Waverly Gallery".
His play, "Lobby Hero", at the Redtwist Theatre in Chicago, Illinois was nominated for the 2011 Non-Equity Joseph Jefferson Award for Production of a Play.
Directed 4 Oscar nominated performances: Laura Linney, Casey Affleck, Michelle Williams and Lucas Hedges. Affleck won for his performance in Manchester by the Sea (2016).
He is of Ashkenazi Jewish (mother) and Irish (father) descent.
Wrote an early draft of Mr. Peabody & Sherman (2014) without credit.
Did an uncredited rewrite of Fool's Gold (2008).
Father, with J. Smith-Cameron, of daughter Nellie Lonergan.
Cites Close Encounters of the Third Kind (1977) as one of his favorite films and director Stanley Kubrick as a major filmmaking influence.