[2] He was a Special Master for the Chancery Court of Pulaski County, Arkansas in 1983.

[2] His service terminated on June 1, 1992, due to his elevation to the court of appeals.

[2] Arnold was nominated by President George H. W. Bush on November 6, 1991, to a seat on the United States Court of Appeals for the Eighth Circuit vacated by Judge Donald P.

[2] He assumed inactive senior status on September 1, 2013, but he returned to the court in January 2016.

[3][4] Arnold has been the recipient of many academic honors, including multiple Honorary Doctor of Laws (LLD and JD) from the University of Pennsylvania, the University of Connecticut, UALR, UA, and others.