Solve the following sql problem:
Who were the owners of eateries which had highest health hazard by improper cooking time or temperatures?

Schema:
SCHEMA:
- Table: businesses
  - Column: business_id
    - Samples: [10, 24, 31, 45, 48]
  - Column: name
    - Samples: [Tiramisu Kitchen, OMNI S.F. Hotel - 2nd Floor Pantry, Norman's Ice Cream and Freezes, CHARLIE'S DELI CAFE, ART'S CAFE]
  - Column: address
    - Samples: [033 Belden Pl, 500 California St, 2nd  Floor, 2801 Leavenworth St, 3202 FOLSOM St, 747 IRVING St]
  - Column: city
    - Samples: [San Francisco, San Francisco, San Francisco, S.F., SAN FRANCISCO]
  - Column: postal_code
    - Samples: [94104, 94104, 94133, 94110, 94122]
  - Column: latitude
    - Samples: [37.7911, 37.7929, 37.8072, 37.7471, 37.764]
  - Column: longitude
    - Samples: [-122.404, -122.403, -122.419, -122.414, -122.466]
  - Column: phone_number
    - Samples: [None, None, None, None, None]
  - Column: tax_code
    - Samples: [H24, H24, H24, H24, H24]
  - Column: business_certificate
    - Samples: [779059, 352312, 346882, 340024, 318022]
  - Column: application_date
    - Samples: [None, None, None, 2001-10-10, None]
  - Column: owner_name
    - Samples: [Tiramisu LLC, OMNI San Francisco Hotel Corp, Norman Antiforda, HARB, CHARLES AND KRISTIN, YOON HAE RYONG]
  - Column: owner_address
    - Samples: [33 Belden St, 500 California St, 2nd Floor, 2801 Leavenworth St, 1150 SANCHEZ, 1567 FUNSTON AVE]
  - Column: owner_city
    - Samples: [San Francisco, San Francisco, San Francisco, S.F., SAN FRANCISCO]
  - Column: owner_state
    - Samples: [CA, CA, CA, CA, CA]
  - Column: owner_zip
    - Samples: [94104, 94104, 94133, 94114, 94122]
- Table: inspections
  - Column: business_id
    - Samples: [10, 10, 10, 10, 10]
  - Column: score
    - Samples: [92, None, 94, None, 82]
  - Column: date
    - Samples: [2014-01-14, 2014-01-24, 2014-07-29, 2014-08-07, 2016-05-03]
  - Column: type
    - Samples: [Routine - Unscheduled, Reinspection/Followup, Routine - Unscheduled, Reinspection/Followup, Routine - Unscheduled]
- Table: violations
  - Column: business_id
    - Samples: [10, 10, 10, 10, 10]
  - Column: date
    - Samples: [2014-07-29, 2014-07-29, 2014-01-14, 2014-01-14, 2014-01-14]
  - Column: violation_type_id
    - Samples: [103129, 103144, 103119, 103145, 103154]
  - Column: risk_category
    - Samples: [Moderate Risk, Low Risk, Moderate Risk, Low Risk, Low Risk]
  - Column: description
    - Samples: [Insufficient hot water or running water, Unapproved or unmaintained equipment or utensils, Inadequate and inaccessible handwashing facilities, Improper storage of equipment utensils or linens, Unclean or degraded floors walls or ceilings]

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'