James R. "Sonny" Chastain, Jr.




Mr. Chastain is a partner with the law firm of Kean Miller in the Baton Rouge office. He brings over thirty years of legal experience as a litigator handling commercial litigation and intellectual property matters. Mr. Chastain began his career as a law clerk to Judge Frank J. Polozola of the United States District Court in Baton Rouge and has been in private practice since 1990. He has handled federal and state trial and appellate litigation.



Mr Chastain was admitted to Bar: Louisiana, 1989; U.S. District Court: Eastern, Middle and Western Districts of Louisiana; U.S. Court of Appeals, Fifth Circuit; United States Supreme Court.

Mr. Chastain is a member of the Louisiana State Bar Association, Baton Rouge Bar Association, AV rating from Martindale-Hubbell, Wex S. Malone, and American Inn of Court since 2012. Mr. Chaistain is also 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, Board of Directors at the Volunteer Baton Rouge. In addition, 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, and is a Law Studies Instructor at the Catholic High School.

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