The Rt Hon. Dame Dehra S. Parker, GBE, PC (NI), the longest serving female MP in the House of Commons of Northern Ireland, is born in a military hospital in Dehradun, north of Delhi, India, on August 13, 1882.

Parker is born Dehra Kerr-Fisher, the only child of James Kerr-Fisher and his wife Annie. Her father, a native of Kilrea, County Londonderry, is a successful financier. She is educated in the United States, where her father holds extensive property holdings, and in Germany. The surname has been spelled, alternatively, as Ker-Fisher or Ker Fisher.

Parker is married twice. Her first husband is Lieutenant Colonel Robert Peel Dawson Spencer Chichester, MP, with whom she has one son and one daughter, Robert James Spencer Chichester (1902–1920) and Marion Caroline Dehra Chichester (1904–1976). She is predeceased by her son. On June 4, 1928, she marries her second husband, Admiral Henry Wise Parker (CB, CMG).

Parker is first elected as a Member of Parliament (MP) for Londonderry, as Dehra Chichester, as she is known prior to her second marriage in 1928, in the 1921 Northern Ireland general election. She stands down at the 1929 election just before her second marriage but is elected unopposed as Dehra Parker in the March 15, 1933 by-election for the South Londonderry constituency following the death of her son-in-law James Lenox-Conyngham Chichester-Clark. She serves until her resignation on June 15, 1960. Her grandson, James Chichester-Clark, is elected unopposed at the subsequent by-election. He later serves as the fifth Prime Minister of Northern Ireland from 1969 to 1971.

From her re-election in 1933 until her retirement in 1960, Parker faces opposition only once. During the 1949 Northern Ireland general election, with anti-partition agitation a common theme across the region, she is opposed in South Londonderry by a Nationalist Party candidate, T. B. Agnew, whom she defeats. She is a Parliamentary Secretary to the Ministry of Education from December 1, 1937, to March 15, 1944. She is also Chair of the Northern Ireland General Health Services Board from 1948 to 1949. She serves as Minister of Health and Local Government from August 26, 1949, to March 13, 1957, and becomes a member of the Privy Council of Northern Ireland in 1949. She is elevated to Dame Commander of the Order of the British Empire in the 1949 Birthday Honours “for public services,” having previously been appointed as an OBE, and is advanced to be a Dame Grand Cross of the Order of the British Empire (GBE) in 1957.

Parker’s promotion to the Cabinet at the age of 67 under Sir Basil Brooke (later created the 1st Viscount Brookeborough) is part of his so-called “reforming” premiership, his predecessor, J. M. Andrews, having been criticised for appointing elderly members to Cabinet. She is the first woman to serve in the Northern Ireland Cabinet.

Outside of parliamentary activities, Parker is a long-serving local councilor on Magherafelt District Council, president of both the Northern Ireland Physical Training Association and the Girls’ Training Corps, and chairman of the Ancient Monuments Advisory Committee. In 1944, she is appointed senior vice-chairman of the Council for the Encouragement of Music and the Arts (CEMA NI), and in 1949 she succeeds Sir David Lindsay Keir as President for CEMA, a position she holds until 1960. She is made an honorary member of the Ulster Society of Women Artists in 1958.

Parker dies at her home, Shanemullagh House, Castledawson, in the south of County Londonderry, on November 28, 1963, at age 81. She is interred two days later in the grounds of Christ Church, Castledawson.