Write SQL query to solve given problem: Who were the owners of eateries which had highest health hazard by improper cooking time or temperatures?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.owner_name FROM violations AS T1 INNER JOIN businesses AS T2 ON T1.business_id = T2.business_id WHERE T1.risk_category = 'High Risk' AND T1.description = 'Improper cooking time or temperatures'