| 2024 | Gretchen C Northrup Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2024 | Trinity University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Gretchen C Northrup Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Trinity University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2022 | Southwest Research Institute | 990 | Director | 3 | $39,750 | $0 | View return |
| 2022 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $39,750 | View return |
| 2022 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $39,750 | View return |
| 2021 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $42,500 | View return |
| 2020 | Southwest Research Institute | 990 | Director | 3 | $44,750 | $0 | View return |
| 2020 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $44,750 | View return |
| 2020 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $44,750 | View return |
| 2019 | Southwest Research Institute | 990 | Director | 3 | $34,500 | $0 | View return |
| 2019 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $34,500 | View return |
| 2019 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $34,500 | View return |
| 2018 | Southwest Research Institute | 990 | Director | 2 | $30,000 | $0 | View return |
| 2018 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $30,000 | View return |
| 2018 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $30,000 | View return |
| 2017 | Southwest Research Institute | 990 | Director | 2 | $34,500 | $0 | View return |
| 2017 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $34,500 | View return |
| 2017 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $34,500 | View return |
| 2016 | Southwest Research Institute | 990 | Director | 2 | $14,250 | $0 | View return |
| 2016 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $14,250 | View return |
| 2016 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $14,250 | View return |
| 2015 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $0 | View return |
| 2015 | Tom Slick Memorial for Southwest Research Institute | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2015 | Southwest Research Institute | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $0 | View return |
| 2014 | Trinity University | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | Southwest Research Institute | 990 | Director | 2 | $0 | $0 | View return |
| 2013 | Southwest Research Institute Voluntary Employees' Beneficiary Association | 990 | Director | 0.1 | $0 | $0 | View return |
| 2013 | Southwest Research Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2013 | Trinity University | 990 | Chairman | 0 | $0 | $0 | View return |