New York-based writer Gregory Zuckerman is protected by the state’s Shield Law from revealing, as part of an Oklahoma divorce action, the confidential information he gathered while writing his 2013 book on “wildcat” natural gas entrepreneurs, a Manhattan judge has ruled.

Supreme Court Justice Donna Mills (See Profile) denied the attempt by the wife of Harold Hamm, one of the six businessmen profiled in Zuckerman’s book, to subpoena the writer to produce all “audio and visual recordings, notes, interviews, emails, materials, records, well valuation, and all other documents” related to Hamm and his company, Continental Resources, Inc. (CRI) of Oklahoma City.