Rosengart, a former federal prosecutor who has represented several celebrities in recent years, about having him take over and push for an end to the conservatorship, according to the person.
Confidential court documents recently obtained by The New York Times revealed that Ms. Spears had expressed strong objections to the conservatorship over several years and questioned her father’s fitness as conservator.
Since her June 23 statement to the court, several pillars of the conservatorship have fallen: Bessemer Trust, the wealth-management firm that was set to take over as the co-conservator of her estate, requested to withdraw; Ms. Spears’s longtime manager, Larry Rudolph, resigned; and Samuel D.
Mr. Rosengart, 58, once served as a law clerk for the former New Hampshire state judge David Souter, shortly before he was nominated to the Supreme Court.
After leaving the Justice Department, he worked as a white-collar defense attorney and civil litigator.
In Mr. Penn’s case, Mr. Rosengart helped him win a defamation case against a director who made claims about Mr. Penn’s past behavior.
It is unknown what private discussions Mr. Ingham and Ms. Spears have had about whether or how she could ask to end the conservatorship.
Ms. Spears’s personal conservator, Jodi Montgomery, recently filed an urgent request for the court to appoint a guardian ad litem who would be assigned solely to help Ms. Spears choose her own lawyer.