Professor Scarisbrick has also been at the cutting edge of educational work about abortion.
Life Charity has announced that founder and Chairman Prof Jack Scarisbrick has stepped down after 47 years. His wife Nuala, with whom he founded Life in 1970 in response to the 1967 Abortion Act, has also stepped down from the Board of Trustees.
John Smeaton, SPUC's chief executive said: "I know that all of SPUC's supporters will join me in thanking and congratulating Professor Scarisbrick on his incomparable work for unborn children and their mothers.
"For over 45 years through the work of Life, Professor Jack Scarisbrick has built a compassionate and life-saving network of support for mothers facing hardship during pregnancy. His work has been a jewel in the crown of the pro-life movement in Britain.
"Professor Scarisbrick has also been at the cutting edge of educational work about abortion. His publication 'What's Wrong with Abortion' was what convinced me personally in 1973 that defending the lives of unborn children was the greatest human rights struggle of the 20th century."