From 1978 to 1994, Justice Wiener was an Associate Justice of the California Court of Appeal, Fourth Appellate District, Division One. He also served on assignment to the California Supreme Court as well as an assigned settlement judge for the San Diego Superior Court. He was on the Superior Court for San Bernardino County from 1975 to 1978.
Justice Wiener's nineteen years of general law practice were primarily devoted to business litigation. He was president of the Pomona Valley Bar Association, Trustee of the Los Angeles County Bar Association and a member and Vice-President of the Board of Governors of the California State Bar. He was also a member of the Executive Board and Vice President of the California Judges Association.
During the year 1977-1978, Justice Wiener taught alternative dispute resolution at Claremont Graduate School. He has also been an adjunct professor at the University of San Diego Law School (1979-1986) and California Western School of Law (1986-1994) teaching professional responsibility and appellate advocacy respectively. He is a member of the Advisory Board of California Western's Center for Creative Problem Solving.
Justice Wiener has served on the Executive Board of the State Bar Court and the Board of Overseers of the University of California, San Diego. He is also a charter member and Honorary Master of the Louis M. Welsh Inn of court and organizing President and Master of the William B. Enright American Inn of Court. He is a member of the California Academy of Appellate Lawyers and on the Board of Trustees of California Western School of Law.
He is a frequent lecturer on varied subjects including appellate practice, ethics, insurance coverage, tort liability and damages for the California Bar Association, the California State Bar and The Rutter Group. He is co-author of The Rutter Group's California Practice Guides "Civil Appeals and Writs" and "Professional Responsibility". He is a member of the Witkin Advisory Board.
A graduate of Brown University and Harvard Law School, Justice Wiener received a Master of Laws degree in the judicial process from the University of Virginia Law School in 1982. In 1984 he attended Oriel College at Oxford University as a member of the first Oriel seminar in legal studies for American judges. In June, 1993 he participated in the Negotiation Workshop; in 1995, the Advanced Negotiation Workshop; and in 2001, the Advanced Mediation Seminar, all at Harvard Law School's Program of Instruction for Lawyers.
Justice Wiener is available as a mediator, arbitrator or private judge in complex litigation.