Blackmun was a Supreme Court Justice who served from 1970 to 1994. He is best known for his dissenting opinion in Roe v. Wade, which legalized abortion in the United States. His colleague, Stephen BREYER, was appointed to the Supreme Court in 1994 and is still serving today. Blackmun and BREYER both dissented on many cases during their time on the court, making them two of the most influential justices in American history.