| 2024 | Middendorf Foundation Inc. | 990PF | President | 5 | $59,013 | $702 | View return |
| 2024 | Greenacre Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Middendorf Foundation Inc. | 990PF | President | 5 | $58,663 | $1,709 | View return |
| 2023 | Greenacre Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2022 | Middendorf Foundation Inc. | 990PF | President | 5 | $62,107 | $1,727 | View return |
| 2022 | Greenacre Foundation | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2021 | Middendorf Foundation Inc. | 990PF | President | 5 | $61,124 | $1,316 | View return |
| 2021 | Middendorf Foundation Inc. | 990PF | President | 5 | $22,800 | $0 | View return |
| 2021 | Greenacre Foundation | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2020 | Middendorf Foundation Inc. | 990PF | President | 5 | $45,600 | $0 | View return |
| 2020 | Greenacre Foundation | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2020 | North Country Garden Club of Long Island Inc | 990EZ | President | 15 | $0 | $0 | View return |
| 2019 | Middendorf Foundation Inc. | 990PF | President | 5 | $25,600 | $0 | View return |
| 2019 | Greenacre Foundation | 990PF | Officer | 0 | $0 | $0 | View return |
| 2019 | North Country Garden Club of Long Island Inc | 990EZ | President | 15 | $0 | $0 | View return |
| 2018 | Middendorf Foundation Inc. | 990PF | President | 5 | $5,600 | $0 | View return |
| 2018 | Greenacre Foundation | 990PF | Officer | 0 | $0 | $0 | View return |
| 2018 | The Community Foundation of Oyster Bay Inc | 990 | Vice President | 1 | $0 | $0 | View return |
| 2018 | North Country Garden Club of Long Island Inc | 990EZ | President | 15 | $0 | $0 | View return |
| 2017 | Middendorf Foundation Inc. | 990PF | Secretary | 5 | $5,600 | $0 | View return |
| 2017 | The Community Foundation of Oyster Bay Inc | 990 | Vice President | 1 | $0 | $0 | View return |
| 2017 | North Country Garden Club of Long Island Inc | 990EZ | Vice President | 10 | $0 | $0 | View return |
| 2017 | Greenacre Foundation | 990PF | Officer | 0 | $0 | $0 | View return |
| 2016 | Middendorf Foundation Inc. | 990PF | Secretary | 5 | $5,600 | $0 | View return |
| 2016 | The Community Foundation of Oyster Bay Inc | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | North Country Garden Club of Long Island Inc | 990EZ | Vice President | 10 | $0 | $0 | View return |
| 2015 | Middendorf Foundation Inc. | 990PF | Secretary | 5 | $5,600 | $0 | View return |
| 2015 | North Country Garden Club of Long Island Inc | 990EZ | Program Manager | 15 | $0 | $0 | View return |
| 2014 | Middendorf Foundation Inc. | 990PF | Secretary | 5 | $4,200 | $0 | View return |
| 2014 | Jefferson Scholars Foundation | 990 | Foundation Board Of Direct | 1.5 | $0 | $0 | View return |
| 2014 | North Country Garden Club of Long Island Inc | 990EZ | Program Manager | 15 | $0 | $0 | View return |
| 2013 | Middendorf Foundation Inc. | 990PF | Secretary | 5 | $5,600 | $0 | View return |
| 2013 | Jefferson Scholars Foundation | 990 | Foundation Board Of Direct | 1 | $0 | $0 | View return |
| 2012 | Middendorf Foundation Inc. | 990PF | Secretary & Trustee | 5 | $5,600 | $0 | View return |
| 2011 | Middendorf Foundation Inc. | 990PF | Trustee | 5 | $6,200 | $0 | View return |