Judge Wagner is a seasoned legal professional with over 40 years of experience as a trial lawyer, judge, and neutral. Before his appointment, he represented clients on both sides and tried complex cases in state and federal courts. At the age of 31, he was appointed as a United States Magistrate Judge in the Northern District of Oklahoma, where he was tasked with reducing the court’s extensive backlog. He successfully achieved this by establishing a court-annexed mediation program while maintaining a full civil calendar and serving as a mediator. His innovative program became an example for federal courts across the country.
After 12 years of dedicated service, he left the court to pursue his passion for alternative dispute resolution full-time. He co-founded the ADR Center at Irell & Manella before joining Judicate West in 2005. Throughout his career, he has served as a mediator, arbitrator, private judge, special master, and referee in thousands of cases.
Judge Wagner specializes in legally challenging matters involving multiple parties and has earned a reputation for excelling in particularly protracted, difficult, and emotionally charged cases. He prides himself in his persistence and consistently utilizes new and creative techniques to help parties achieve resolution.
Below is a sampling of the various matters Hon. John Leo Wagner, Ret. presided over on the bench, tried as an attorney, or handled as a neutral.
Read More
In his spare time, Judge Wagner enjoys spending time with his wife and two sons, who share in his interest in muscle cars, backpacking, chess and travel.
"I am writing to express my gratitude and to describe my experience with Judge Wagner. Judge Wagner is as accomplished and hard working mediator who agreed to take our case despite a full schedule. Two prior mediations on the case were fruitless. Despite this, he calmly and strategically mapped out a plan to satisfy nine different parties. Through strict dedication, Judge Wagner was able to keep the parties engaged, where many other mediators would have simply quit. My hat is off to Judicate West, and specifically to John Leo Wagner."
- Attorney, Inland Empire, California
"Judge Wagner was amazing and we were able to settle this case because of his efforts. "
- Attorney on an Employment Hostile Environment case
"Judge Wagner was patient when appropriate, firm when he needed to be and "acted like a judge" when that was needed, and that was very helpful in the process. I loved his methodology for reducing plaintiff's demands and increasing defendant's offers."
- Attorney, Orange County, California
"He took the time to listen and proposed creative resolutions."
- Attorney on a Complex Commercial Dispute
"Thank you again for your all your help today; we really appreciate it. I spoke with opposing counsel after the mediation and they thought it was a great idea that we suggested you to mediate the case. He was really impressed and (like us) thought highly of you."
- Attorney on a Consumer Class Action Dispute
"Judge Wagner was simply outstanding. I will use him again for sure."
- Attorney on a Complex Commercial Matter
"Judge Wagner was creative in fashioning a compromise. "
- California Attorney General, Ret.
"Judge Wagner was excellent! This was a difficult case with a lot of emotion, and no one thought it would actually settle. He immediately gained credibility with the client under difficult circumstances."
- Attorney on a Business/Contractual Matter
601 S. Figueroa
Ste 3400
Los Angeles, CA 90017
Phone: 213.223.1113
Fax : 213.223.1114
980 9th Street
Suite 2200
Sacramento, CA 95814
Phone: 916.394.8490
Fax : 916.394.8495
402 W. Broadway
Ste 2400
San Diego, CA 92101
Phone: 619.814.1966
Fax : 619.814.1967
1851 East First Street
Ste 1600
Santa Ana, CA 92705
Phone: 714.834.1340
Fax : 714.834.1344
1925 Century Park East
Suite 1700
Los Angeles, CA 90067
Phone: 800.488.8805
Fax :
2023.6.1.2rt