In the 1960s she worked as a journalist in the United States, following the campaign of Rev.
Martin Luther King Jr. She married, returned to Britain in 1970 with her husband and son and undertook her postgraduate law degree at the
London School of Economics. Her younger son was born in London after her permanent return to England. as a trainee, she continued to work as a senior partner of Birnberg Peirce and Partners. During her career she represented
Judith Ward, who had been wrongfully convicted in 1974 of several
IRA-related bombings, the
Guildford Four, the
Birmingham Six, several mineworkers after the
Battle of Orgreave, the family of
Jean Charles de Menezes and
Moazzam Begg, a man held in
extrajudicial detention by the American government.
Julian Assange, the founder of
WikiLeaks, appointed Peirce as his solicitor in
Assange v Swedish Prosecution Authority. She was among the doctors and lawyers who were spied on by
UC Global while visiting Assange at the Ecuadorian embassy.
Santiago Pedraz, the
Audiencia Nacional judge who is overseeing the case against UC Global's David Morales, issued court orders requesting permission of UK authorities to take witness testimony from Peirce and others. ==Recognition and reception==