| 2024 | Southern Cove Power Reunion Inc. | 990 | Board | 1 | $0 | $0 | View return |
| 2024 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2023 | Southern Cove Power Reunion Inc. | 990 | Board | 1 | $0 | $0 | View return |
| 2023 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2023 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2022 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2022 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2021 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2021 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2020 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2020 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2019 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2019 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2018 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2018 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2017 | National Inventors Hall of Fame Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2017 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2016 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2016 | Summit Education Initiative | 990 | Board Member | 1 | $0 | $0 | View return |
| 2016 | Northeast Ohio Council on Higher Education | 990 | Chairman | 1 | $0 | $0 | View return |
| 2016 | Shelter Care Endowment Fund Inc. | 990 | Chairman | 1 | $0 | $0 | View return |
| 2015 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2015 | National Inventors Hall of Fame Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2015 | Summit Education Initiative | 990 | Board Member | 1 | $0 | $0 | View return |
| 2015 | Northeast Ohio Council on Higher Education | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | National Inventors Hall of Fame Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2014 | Summit Education Initiative | 990 | Board Member | 1 | $0 | $0 | View return |
| 2014 | Northeast Ohio Council on Higher Education | 990 | Chairman | 1 | $0 | $0 | View return |
| 2013 | Mark & Elizabeth Hamlin Family Foundation | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2013 | National Inventors Hall of Fame Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2013 | Summit Education Initiative | 990 | Board Member | 1 | $0 | $0 | View return |
| 2013 | Northeast Ohio Council on Higher Education | 990 | Chairman | 1 | $0 | $0 | View return |