| 2024 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2024 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2023 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2023 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2022 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2022 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2022 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2021 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2021 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2021 | Monumental Sports & Entertainment Foundation | 990 | Chairperson (Thru 10/1/2021) | 1 | $0 | $0 | View return |
| 2020 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2020 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2020 | Monumental Sports & Entertainment Foundation | 990 | Chairman | 1 | $0 | $0 | View return |
| 2019 | The Leonsis Foundation Inc. | 990PF | Vice President | 0 | $0 | - | View return |
| 2019 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2019 | Greater Washington Partnership (Fka Washington 2024) | 990 | Vice Chair | 1 | $0 | $0 | View return |
| 2019 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2018 | The Leonsis Foundation Inc. | 990PF | Director, VP, & Treasurer | 0 | $0 | $0 | View return |
| 2018 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2018 | Greater Washington Partnership (Fka Washington 2024) | 990 | Vice Chair | 1 | $0 | $0 | View return |
| 2018 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2017 | Greater Washington Partnership (Fka Washington 2024) | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2017 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2017 | The Leonsis Foundation Inc. | 990PF | Director, VP, & Treasurer | 0 | $0 | $0 | View return |
| 2016 | The Leonsis Foundation Inc. | 990PF | Director, VP, & Treasurer | 0 | $0 | $0 | View return |
| 2016 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2016 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2016 | Greater Washington Partnership (Fka Washington 2024) | 990 | Director, Vice Chair | 15 | $0 | $0 | View return |
| 2015 | The Leonsis Foundation Inc. | 990PF | Director, VP, & Treasurer | 0 | $0 | $0 | View return |
| 2015 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2015 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2015 | Greater Washington Partnership (Fka Washington 2024) | 990 | Director, Vice Chair | 15 | $0 | $0 | View return |
| 2014 | The Leonsis Foundation Inc. | 990PF | Director, VP & Treasurer | 0 | $0 | - | View return |
| 2014 | Hellenic Initiative Inc. | 990 | Board Member | 0.5 | $0 | $0 | View return |
| 2014 | Greater Washington Partnership (Fka Washington 2024) | 990 | Director, Vice Chair | 15 | $0 | $0 | View return |
| 2014 | Monumental Sports & Entertainment Foundation | 990 | Chairman/Director | 1 | $0 | $0 | View return |
| 2013 | The Leonsis Foundation Inc. | 990PF | Director, VP & Treasurer | 0 | $0 | - | View return |
| 2013 | Washington Mystics Foundation | 990EZ | Chairman | 1 | $0 | $0 | View return |
| 2012 | The Leonsis Foundation Inc. | 990PF | Director, VP & Treasurer | 0 | $0 | $0 | View return |
| 2011 | The Leonsis Foundation Inc. | 990PF | Director, VP & Treasurer | 0 | $0 | - | View return |
| 2010 | The Leonsis Foundation Inc. | 990PF | Director, VP & Treasurer | 0 | $0 | $0 | View return |