Arthur Grim is currently the chairman of Pennsylvania's Juvenile Court Judges' Commission and a member of the Juvenile Justice and Delinquency Prevention Committee to the Pennsylvania Commission on Crime and Delinquency. Previously, he was a judge of the Court of Common Pleas of Berks County and served as administrative head of the Juvenile Court from 1987 to 2007. He was also president judge of the Court of Common Pleas 23rd Judicial District from 2004 to 2008.
In February 2009, he was appointed as special master by the Supreme Court of Pennsylvania to review all juvenile cases presided over by Judge Mark A. Ciavarella Jr., who improperly committed juveniles to two detention facilities and denied them their constitutional right to counsel. As a result of Grim's findings and recommendations, the state supreme court entered an order expunging the records of more than 3,000 juveniles.
Grim served as an adjunct professor at Alvernia University and at St. Joseph University, was president of the Pennsylvania State Trial Judges Association Juvenile Justice Section from 2003 to 2005, and has been on the governor's Cabinet on Children and Families since 2005.
He gathered and led a committed group of community leaders for the Berks County Disproportionate Minority Contact Reduction Steering Committee and was a visiting juvenile justice consultant for the Yale Law School-China Law Center in August 2010. In the wake of the Jerry Sandusky tragedy at Penn State, Grim was appointed by the governor as the judicial representative to the statewide Task Force on Child Protection.