| 2025 | International Brotherhood of Electrical Workers | 990 | Business Representative | 48 | $133,769 | $0 | View return |
| 2024 | International Brotherhood of Electrical Workers | 990 | Business Representative | 48 | $124,020 | $0 | View return |
| 2024 | National Association of Letter Carriers Branch 2128 | 990EZ | Second Vice President | 2 | $4,979 | $0 | View return |
| 2024 | Attic Theatre Inc. | 990EZ | President | 25 | $0 | $0 | View return |
| 2024 | An Orphans Dream Inc. | 990EZ | Treasurer | 4 | $0 | $0 | View return |
| 2024 | Nrhs Fund Inc. | 990 | President | 2 | $0 | $0 | View return |
| 2024 | Santa Barbara Ski Club Corporation | 990EZ | President | 3 | $0 | $0 | View return |
| 2024 | Catskill Regional Medical Center Foundation Inc. | 990 | President | 1 | $0 | $0 | View return |
| 2024 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | President | 0 | $0 | $0 | View return |
| 2024 | Attic Theatre Inc. | 990EZ | President | 25 | $0 | $0 | View return |
| 2023 | National Association of Letter Carriers Branch 2128 | 990EZ | Second Vice President | 2 | $4,957 | $0 | View return |
| 2023 | The Ellie Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | Attic Theatre Inc. | 990EZ | President | 5 | $0 | $0 | View return |
| 2023 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | President | 0 | $0 | $0 | View return |
| 2023 | An Orphans Dream Inc. | 990EZ | Treasurer | 4 | $0 | $0 | View return |
| 2023 | Nrhs Fund Inc. | 990 | President | 2 | $0 | $0 | View return |
| 2023 | Rotary International-Elyria Rotary Club | 990EZ | Immediate Pa | 0 | $0 | - | View return |
| 2022 | National Association of Letter Carriers Branch 2128 | 990EZ | Second Vice President | 2 | $3,559 | $0 | View return |
| 2022 | Ibew Local 343 Building Corporation | 990 | Director-Past | 0.3 | $0 | $51,726 | View return |
| 2022 | Attic Theatre Inc. | 990EZ | President | 10 | $0 | $0 | View return |
| 2022 | An Orphans Dream Inc. | 990EZ | President | 4 | $0 | $0 | View return |
| 2022 | Nrhs Fund Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | The C William Hetzer Charitable Supporting Trust | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2022 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | President | 0 | $0 | $0 | View return |
| 2022 | The Ellie Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Needham Golf Club Inc | 990 | President | 4 | $0 | $0 | View return |
| 2022 | Rotary International-Elyria Rotary Club | 990EZ | President | 1 | $0 | - | View return |
| 2022 | The Ellie Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | Plowshares Farm Center for Education & Spirituality Inc | 990EZ | Executive Director And Retreat Facilitator | 40 | $24,491 | $0 | View return |
| 2021 | National Association of Letter Carriers Branch 2128 | 990EZ | Second Vice President | 2 | $2,788 | $0 | View return |
| 2021 | The C William Hetzer Charitable Supporting Trust | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2021 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | President | 0 | $0 | $0 | View return |
| 2021 | Attic Theatre Inc. | 990EZ | Vice President | 5 | $0 | $0 | View return |
| 2021 | The Ellie Fund | 990 | Board Member | 0.33 | $0 | $0 | View return |
| 2021 | Ibew Local 343 Building Corporation | 990 | Director | 0.3 | $0 | $0 | View return |
| 2021 | Nrhs Fund Inc. | 990 | President | 2 | $0 | $0 | View return |
| 2021 | An Orphans Dream Inc. | 990EZ | Treasurer | 4 | $0 | $0 | View return |
| 2020 | Cook Inletkeeper | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Attic Theatre Inc. | 990EZ | Vice President | 2 | $0 | $0 | View return |
| 2020 | Ibew Local 343 Building Corporation | 990 | Director | 0.3 | $0 | $0 | View return |
| 2020 | The C William Hetzer Charitable Supporting Trust | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2020 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2020 | Nrhs Fund Inc. | 990 | President | 2 | $0 | $0 | View return |
| 2020 | National Railway Historical Society Inc. | 990 | Director | 3 | $0 | $0 | View return |
| 2020 | Needham Golf Club Inc | 990 | Vice President | 4 | $0 | $0 | View return |
| 2019 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2019 | National Railway Historical Society Inc. | 990 | Secretary | 3 | $0 | $0 | View return |
| 2019 | Ibew Local 343 Building Corporation | 990 | Director | 0.3 | $0 | $0 | View return |
| 2019 | Nrhs Fund Inc. | 990 | President | 2 | $0 | $0 | View return |
| 2019 | The C William Hetzer Charitable Supporting Trust | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2019 | Cook Inletkeeper | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Needham Golf Club Inc | 990 | Vice President | 4 | $0 | $0 | View return |
| 2018 | Attic Theatre Inc. | 990EZ | Vice President | 9 | $0 | $0 | View return |
| 2018 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2018 | The C William Hetzer Charitable Supporting Trust | 990 | Trustee | 0.1 | $0 | $0 | View return |
| 2018 | National Railway Historical Society Inc. | 990 | Secretary | 5 | $0 | $0 | View return |
| 2018 | Nrhs Fund Inc. | 990 | Secretary | 1 | $0 | $0 | View return |
| 2018 | Needham Golf Club Inc | 990 | Vice President | 4 | $0 | $0 | View return |
| 2017 | National Railway Historical Society Inc. | 990 | Secretary - Global Director | 5 | $0 | $0 | View return |
| 2017 | Nrhs Fund Inc. | 990 | Secretary | 1 | $0 | $0 | View return |
| 2017 | Attic Theatre Inc. | 990EZ | Vice President | 8 | $0 | $0 | View return |
| 2017 | Mason-Dixon Council Inc Boy Scouts of America | 990 | Director | 1.7 | $0 | $0 | View return |
| 2017 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2016 | National Railway Historical Society Inc. | 990 | Secretary | 5 | $0 | $0 | View return |
| 2016 | Attic Theatre Inc. | 990EZ | Board Member | 4 | $0 | $0 | View return |
| 2016 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 3 | $0 | $0 | View return |
| 2016 | Nrhs Fund Inc. | 990EZ | Secretary & | 1 | $0 | - | View return |
| 2016 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2016 | The Builders & Remodelers Assoc of Great Boston Inc Bragb | 990 | President | 1 | $0 | $0 | View return |
| 2016 | Mason-Dixon Council Inc Boy Scouts of America | 990 | Director | 1.7 | $0 | $0 | View return |
| 2016 | Catskill Regional Medical Center Foundation Inc. | 990 | Vice President/Treasurer | 1 | $0 | $0 | View return |
| 2016 | Sullivan County Community College Dormitory Corporation | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2016 | Sullivan County Community College Foundation Inc. | 990 | Vice Chairperson | 0.5 | $0 | $0 | View return |
| 2015 | National Railway Historical Society Inc. | 990 | Secretary | 10 | $0 | $0 | View return |
| 2015 | Mason-Dixon Council Inc Boy Scouts of America | 990 | Director | 1.7 | $0 | $0 | View return |
| 2015 | The Builders & Remodelers Assoc of Great Boston Inc Bragb | 990 | President | 1 | $0 | $0 | View return |
| 2015 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 3 | $0 | $0 | View return |
| 2015 | Nrhs Fund Inc. | 990EZ | Secretary | 1 | $0 | - | View return |
| 2015 | Catskill Regional Medical Center Foundation Inc. | 990 | Vice President/Treasurer | 1 | $0 | $0 | View return |
| 2015 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | - | View return |
| 2015 | Sullivan County Community College Dormitory Corporation | 990 | Board Member | 5 | $0 | $0 | View return |
| 2015 | Sullivan County Community College Foundation Inc. | 990 | Vice Chairman | 5 | $0 | $0 | View return |
| 2014 | Banbury Fund Inc C/O Withumsmithbrown | 990PF | Board Member | 0 | $0 | - | View return |
| 2014 | National Railway Historical Society Inc. | 990 | Secretary | 6 | $0 | $0 | View return |
| 2014 | The Builders & Remodelers Assoc of Great Boston Inc Bragb | 990 | 1st Vice President | 1 | $0 | $0 | View return |
| 2014 | Catskill Regional Medical Center Foundation Inc. | 990 | Treasurer/Vice President | 1 | $0 | $0 | View return |
| 2014 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 3 | $0 | - | View return |
| 2014 | Charles and Marie Robertson Foundation C/O Diana Ernst | 990PF | Director | 0 | $0 | $0 | View return |
| 2014 | Nrhs Fund Inc. | 990EZ | Secretary | 1 | $0 | - | View return |
| 2014 | Mason-Dixon Council Inc Boy Scouts of America | 990 | Director | 1.7 | $0 | $0 | View return |
| 2014 | Sullivan County Community College Foundation Inc. | 990 | Vice Chairman | 1 | $0 | $0 | View return |
| 2014 | Mountain Oak Charter School | 990 | Member | 1 | $0 | $0 | View return |
| 2014 | Sullivan County Community College Dormitory Corporation | 990 | Board Member | 1 | $0 | $0 | View return |
| 2013 | The Builders & Remodelers Assoc of Great Boston Inc Bragb | 990 | 3rd Vice President | 1 | $0 | $0 | View return |
| 2013 | Mason-Dixon Council Inc Boy Scouts of America | 990 | Director | 1.7 | $0 | $0 | View return |
| 2013 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 0 | $0 | - | View return |
| 2013 | National Railway Historical Society Inc. | 990 | Secretary | 1 | $0 | $0 | View return |
| 2013 | Banbury Fund Inc C/O Withumsmithbrown | 990PF | Board Member | 0 | $0 | - | View return |
| 2013 | Catskill Regional Medical Center Foundation Inc. | 990 | Treasurer/Vice President | 1 | $0 | $0 | View return |
| 2013 | Sullivan County Community College Foundation Inc. | 990 | Vice Chairman | 5 | $0 | $0 | View return |
| 2013 | Mountain Oak Charter School | 990 | Member | 1 | $0 | $0 | View return |
| 2013 | Sullivan County Community College Dormitory Corporation | 990 | Board Member | 5 | $0 | $0 | View return |
| 2012 | Banbury Fund Inc C/O Withumsmithbrown | 990PF | Board Member | 0 | $0 | - | View return |
| 2012 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 3 | $0 | - | View return |
| 2011 | Robertson Foundation for Government Inc C/O Withumsmithbrown | 990PF | Board Member | 3 | $0 | $0 | View return |