Former state Supreme Court Justice Andrew G.T. Moore II, regarded as one of the seminal voices in Delaware corporate law, died Monday at the age of 83.

Moore, whose legal career spanned more than five decades, served 12 years on the state high court, where he wrote landmark decisions in Revlon v. MacAndrews & Forbes Holdings and Aronson v. Lewis, among others. A native of New Orleans, Moore also launched the Tulane Corporate Law Institute conference, and in his later years helped to build out the Wilmington office of Gibbons.