Born and raised in Pinal County Judge William J."Bill" O'Neil has served as a Judge of the Superior Court of Arizona in Pinal County since 1991. During that time he has been appointed by various Governors of Arizona and Chief Justices of the Supreme Court of Arizona to virtually every significant statewide committee on the court. He has served as Presiding Judge for the Superior Court from 2001 through 2005 and as Presiding Juvenile Judge (1992-2001). He is the only Pinal County Judge to serve on the Arizona Judicial Council which is the highest level policy making committee of the Supreme Court of Arizona. He currently serves as Chairman of the Committee on the Impact of Domestic Violence and the Courts (CIDVC).

Concerned with his community, state and country, he has served on numerous community service boards and coached various Little League teams, City Soccer teams and Club Soccer teams. His service on various foundation boards has resulted in over $1 million for educational grants for Pinal County students. He has received numerous awards for his judicial service, innovation and work with juveniles and victims. He has lectured on justice issues across the nation. Judge O'Neil loves his wife Tammy, adores his four children and is an avid Arizona Diamondback fan.