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Jack Sinclair has a extensive work history in the construction materials industry. Jack started their career at TXI as a Quality Control Inspector in the Precast Division from 1970 to 1974. Jack then moved on to the TXI Ready Mix Distribution as a Senior Sales Representative from 1974 to 1976. Jack joined Texas Industries, Inc. as a Technical Services employee in 1976 and worked until 1978. Jack then continued their career at TXI as a Senior Sales Representative for the Ready Mix department from 1978 to 1990. In 1991, Jack became a Marketing and Senior Sales Representative at TXI Expanded Shale and Clay. In 1992, they transitioned to TXI Operations, L.P. where they held the role of Marketing and Sales Manager in the Expanded Shale Aggregate Division until 2012.

Jack Sinclair has a diverse education history. Jack attended Midwestern State University from 1968 to 1969, where they studied Business Administration and Management. However, they did not obtain a degree from this institution. Later, from 1973 to 1976, they pursued an Associate's degree in Mid-Management at Tarrant County College. Finally, from 1985 to 1992, Jack enrolled at Dallas Baptist University, where they earned a Bachelor of Business Administration (BBA) degree with a concentration in Management.