On a splendid May morning in 1792 in the Old City of New Amseterdam, The New York Stock Exchange was founded by brokers meeting under a tree in the then-bucolic setting that is now Wall Street.

Art Cashin, UBS’ director of floor operations at the New York Stock Exchange and a man The Washington Post called “Wall Street’s version of Walter Cronkite,” has died. He was 83 and had ...