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Sonny Chastain is a partner in the Baton Rouge office of Kean Miller. He joined the firm in 2000 and practices in the areas of business litigation and intellectual property. Sonny represents clients in various commercial matters regarding contract negotiation and litigation, banking, breach of fiduciary duty, unfair trade practices, and consumer finance. He has experience in truth in lending, fair debt collection practices, antitrust, RICO, employment/non-compete agreements, software licenses, arbitration agreements, investment suitability and broker relations. He also routinely advises clients in matters regarding copyright and trademark registration prosecution, brand management, and IP infringement litigation.


Sonny is listed in Louisiana Super Lawyers, 2016, 2022, and in The Best Lawyers in America, 2021. He was listed by Best Lawyers as the Baton Rouge Lawyer of the Year in Trademark Law for 2018 and 2021. Sonny is AV-rated by Martindale-Hubbell. He is a mediator with Perry Dampf Dispute Solutions.



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James R. “Sonny” Chastain Jr. - America's Top 50 Lawyer - Patent Law - Louisiana

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