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Oil, Gas & Energy

​Leonard, Long & Cassil is well-equipped to represent clients in virtually every aspect of the oil and gas industry. Oklahoma’s economy remains largely energy based, and LLC represents oil and gas operators, non-ops, and individual landowners in state court, federal court, and before the Oklahoma Corporation Commission. LLC attorney Kane Cassil focuses his practice on assisting clients in the oil and gas space in both Texas and Oklahoma and has a broad range of experience handling industry disputes—including high-stakes quiet-title litigation, royalty disputes, operating agreement disputes, prosecuting and defending toxic tort/remediation cases, or negotiating industry transactions.


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