Henry Browne Blackwell (1825 - 1909). He was born in England, the son of sugar refiner Samuel Blackwell. The father moved his family to the United States in 1832, first living in New York City, and later in New Jersey. The father's interest in social reform was passed on to his children.

Henry B. Blackwell, was the husband of Lucy Stone, the college friend of Antoinette Brown at Oberlin College. Stone was an important advocate in the Abolitionism and Women's Rights Movements. Lucy Stone refused to use her husband's name and continued to use her own. Their daughter Alice Stone Blackwell was another leader for women's rights and also for the prohibition of alcohol.

His brother, Samuel C. Blackwell, was the husband of Antoinette Brown, the first woman ordained in a recognized church in the United States, and also a prominent speaker in the abolitionsist and women's suffrage movements.

His sister, Elizabeth Blackwell, was among the first female graduates of medical schools in the United States and the first to practice medicine.