Preston Castille is the district 8 member of the Louisiana Board of Elementary & Secondary Education (BESE). Elected in 2019 and re-elected in 2023, his district includes 14 parishes. He has chaired several committees and served as board vice president. 

Mr. Castille is also president and CEO of Helix Global Foundation and Helix Community Schools, a network of early childhood, elementary and secondary schools in south Louisiana that has a strong emphasis on Science, Technology, Engineering, Arts & Mathematics (STEAM).  

In Baton Rouge, the network includes Helix Mentorship & Maritime Academy and Helix Aviation Academy. The academies are home to the Helix School of Maritime & Aquatic Studies and the Helix School of Space and Aviation. Helix acquired Franciscan High School in 2023 along with its corporate work study program.  It opened Helix College & Career Academy in August 2025.

In Baker, Helix and the Baker School System have partnered to expand and redesign Baker High School and Park Ridge Achievement Academy. They have become Helix FinTech & Performing Arts Academies. 

In Opelousas, Helix and the St. Landry Parish School Board have partnered to open two new schools. Newly constructed, Helix AI & Medical Academy opened earlier this year and has more than 500 K-5 students and will begin adding middle school students in August 2026. Helix plans to begin construction on Helix Agriculture & Energy Academy in late 2026. To more deeply support communities and families, it established Helix Global Foundation, headquartered in Opelousas.

Mr. Castille retired as a partner and Executive Committee member of the Taylor Porter law firm in 2020, after 25 years of practicing business litigation and transactions. He is general counsel and a trustee for the Southern Foundation and previously served as national president for the SU Alumni Federation. Mr. Castille was an adjunct law professor at LSU Law School for eight years and Southern University Law Center for 22 years. The Louisiana Supreme Court appointed him Judge Pro Tempore in 2009, and he presided over hundreds of trials and hearings. He served as president of the Baton Rouge Bar Association in 2011, held leadership roles with the American and Louisiana State Bar Associations, and served on the Louisiana Law Institute. 

Mr. Castille is a member of the board of directors of the St. Landry Chamber of Commerce, JD Bank and JD Bancshares. 

He graduated valedictorian from Plaisance High School, earned a Bachelor of Science in economics from Southern University and a Juris Doctor from Tulane Law School.