From 1998 until 2001, Greenfield was the Producer of the Blue Light Theater Company where she produced several premieres, including Darko Tresnjak's Princess Turandot (which subsequently ran at the Westport Country Playhouse) and Daniel Goldfarb's Adam Baum and the Jew Movie starring Ron Leibman, which won the 1999–2000 Newsday Oppenheimer Award for Best New York Debut.
[1][2] She also produced works for Blue Light by Jessica Goldberg, Helen Edmundson and Philip Ridley.
[3] She produced shows at both The Samuel J. Friedman Theatre on Broadway and New York City Center off-Broadway.
Notable productions include Benjamin Scheuer's The Lion, Tarell Alvin McCraney's Choir Boy, Nell Benjamin's The Explorer's Club, Julia Jordan and Juliana Nash's Murder Ballad, Matthew Lopez's The Whipping Man, David Lindsay-Abaire's Good People, Rabbit Hole, Lynn Nottage’s Ruined, Theresa Rebeck’s Mauritius, and John Patrick Shanley’s Doubt.
Reports included numerous staff and crew complaints about Greenfield's management: belittling subordinates "as if they had no skills or industry experience," demanding responses to text messages at late hours, and refusal to end the Festival's "80- to 100-hour weeks" "with no rest periods or scheduled days off.