Education
University of Kent; University of Auckland.
University of Kent; University of Auckland.
Her parents were Horace and Mary (née Ryan) Sayers. She earned a Bachelor of Arts degree in English Literature from the University of Auckland and a law degree from the University of Kent at Canterbury. When Warren Freer the Minister of Trade and Industry in the Third Labour Government wanted a woman rather than the men proposed by the department for appointment to the Price Tribunal in 1973, Hercus was recommended by Tom McGuigan.
Her ability impressed Freer, so he later appointed her to the Commerce Commission and his successor Lance Adams-Schneider made her the deputy chairman.
From 1988 to 1990, she was Ambassador and Permanent Representative of New Zealand to the United Nations. In 1998, she was appointed Deputy Special Representative and Chief of Mission of the United Nations operation in Cyprus.
She resigned for family reasons in 1999. In 2005, information on salary rates of senior Television New Zealand staff was leaked, Hercus was named as the source.
She resigned in protest from the board of Television New Zealand over the pay rates.
She resigned from the board a second time a year later, hours after former Chief Executive Officer Ian Fraser reported on board dysfunction to a parliamentary select committee. Hercus is the spokesperson for "Save our Arts Centre" (SOAC), an organisation opposing the development of a School of Music for the University of Canterbury at the Christchurch Arts Centre. Hercus now resides in Nelson, New Zealand.
Hercus was the Member of Parliament for Lyttelton from 1978 to 1987, and the Minister of Social Welfare, Police and Women"s Affairs from 1984 to 1987 in ther Fourth Labour Government, the first woman to hold the Police portfolio.