James R. "Sonny" Chastain, Jr.

Sonny Chastain has been a neutral with the Perry Dampf panel since 2018. He is also a partner with the law firm of Kean Miller in the Baton Rouge office. He brings thirty-four years of legal experience as a litigator handling commercial litigation and intellectual property matters to his clients.



To begin his career, Mr. Chastain was a law clerk to Judge Frank J. Polozola of the United States District Court in Baton Rouge and joined the private practice in 1990. He joined Kean Miller in 2000 and primarily practices in the areas of business litigation and intellectual property. Over the years, Mr. Chastain has handled federal and state trial litigation, as well as appellate litigation.

Mr. Chastain received a Bachelor of Science degree in Finance from Louisiana State University in 1986. He received his Juris Doctorate from Louisiana State University’s Paul M. Hebert Law Center in 1989 and was admitted to the Louisiana Bar that same year. He is also admitted to the United States District Courts for the Eastern, Middle and Western Districts of Louisiana; the United States Court of Appeals, Fifth Circuit; and the United States Supreme Court.

Mr. Chastain frequently writes articles, blogs and presents on topics covering all facets of intellectual property. He is a member of the Baton Rouge Bar Association, Louisiana State Bar Association (Intellectual Property Section), American Bar Association (Intellectual Property and Practice Management Sections), and Wex S. Malone American Inn of Court.

In addition to his professional activities, Mr. Chastain contributes to his community by serving on the Board of Directors at St. Vincent de Paul, Board of Directors at the Baton Rouge Community College Foundation, Board of Directors at the Brothers of the Sacred Heart Foundation, and Board of Directors at the Volunteer Baton Rouge. Further, Mr. Chastain is a member of the Catholic High School Alumni Advisory Board, Sigma Chi Fraternity Alumni Association, and St. Aloysius Church Chorale and Finance Committee. He is a Law Studies Instructor at Catholic High School in Baton Rouge, Louisiana.

Louisiana State Bar Association Baton Rouge Bar Association American Bar Association Martindale-Hubbell American Inns of Court