| 2025 | The Crane Institute of Sustainability Inc. | 990 | Chairman | 0 | $0 | $0 | View return |
| 2024 | The Crane Institute of Sustainability Inc. | 990 | Chairman | 0 | $0 | $0 | View return |
| 2024 | More Perfect Union Action | 990 | Director | 2 | $0 | $0 | View return |
| 2023 | Vermont Energy Investment Corporation | 990 | Director | 1 | $2,000 | $0 | View return |
| 2023 | The Crane Institute of Sustainability Inc. | 990 | Chairman | 0 | $0 | $0 | View return |
| 2023 | Waterfront Alliance Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | More Perfect Union Action | 990 | Director | 2 | $0 | $0 | View return |
| 2023 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2023 | Center for International Environmental Law Inc. | 990 | Chair | 1 | $0 | $0 | View return |
| 2023 | Environmental Film Festival in the Nation'S Capital | 990 | Director | 2 | $0 | $0 | View return |
| 2023 | Center for International Environmental Law Inc. | 990 | Chair | 1 | $0 | $0 | View return |
| 2022 | Vermont Energy Investment Corporation | 990 | Director | 1 | $2,000 | $0 | View return |
| 2022 | Waterfront Alliance Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | The Crane Institute of Sustainability Inc. | 990 | Chairman | 0 | $0 | $0 | View return |
| 2022 | More Perfect Union Action | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Waterfront Alliance Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | Center for International Environmental Law Inc. | 990 | Chair | 1 | $0 | $0 | View return |
| 2022 | Environmental Film Festival in the Nation'S Capital | 990 | Director | 2 | $0 | $0 | View return |
| 2021 | Vermont Energy Investment Corporation | 990 | Director | 1 | $2,000 | $0 | View return |
| 2021 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2021 | Center for International Environmental Law Inc. | 990 | Chair | 1 | $0 | $0 | View return |
| 2021 | More Perfect Union Action | 990 | Director At-Large | 0.13 | $0 | $0 | View return |
| 2021 | The Crane Institute of Sustainability Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2021 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2021 | Environmental Film Festival in the Nation'S Capital | 990 | Director | 2 | $0 | $0 | View return |
| 2020 | Vermont Energy Investment Corporation | 990 | Director | 1 | $2,000 | $0 | View return |
| 2020 | Vermont Energy Investment Corporation | 990 | Director | 1 | $2,000 | $0 | View return |
| 2020 | The Parliament of the World'S Religions | 990 | Trustee | 1 | $0 | $0 | View return |
| 2020 | The Crane Institute of Sustainability Inc. | 990 | Director | 0 | $0 | $0 | View return |
| 2020 | Center for International Environmental Law Inc. | 990 | Vice Chair | 1 | $0 | $0 | View return |
| 2020 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2020 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2020 | Environmental Film Festival in the Nation'S Capital | 990 | Director | 2 | $0 | $0 | View return |
| 2020 | More Perfect Union Action | 990 | Director At-Large | 0.13 | $0 | $0 | View return |
| 2019 | Center for International Environmental Law Inc. | 990 | Vice Chair | 1 | $0 | $0 | View return |
| 2019 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2019 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2019 | The Parliament of the World'S Religions | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2018 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2018 | Center for International Environmental Law Inc. | 990 | Dev. & Fin. Comm. Chair | 1 | $0 | $0 | View return |
| 2018 | Green Mountain College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | National Wildlife Federation | 990 | Director - Until 06/2019 | 3 | $0 | $0 | View return |
| 2017 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2017 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2017 | Center for International Environmental Law Inc. | 990 | Finance Committee Chair | 1 | $0 | $0 | View return |
| 2017 | Green Mountain College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |
| 2016 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2016 | Center for International Environmental Law Inc. | 990 | Development & Finance Committees Chair | 1 | $0 | $0 | View return |
| 2016 | Take the Lead Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2016 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |
| 2016 | Green Mountain College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Integrative Strategies Forum Inc. | 990 | Director | 2 | $0 | $0 | View return |
| 2015 | Green Mountain College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |
| 2014 | Integrative Strategies Forum Inc. | 990EZ | Director | 2 | $0 | $0 | View return |
| 2014 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |
| 2014 | Green Mountain College | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Center for International Environmental Law Inc. | 990 | Board Chair | 2 | $0 | $0 | View return |
| 2013 | Integrative Strategies Forum Inc. | 990EZ | Director | 2 | $0 | $0 | View return |
| 2013 | Green Mountain College | 990 | Trustee | 2 | $0 | $0 | View return |
| 2013 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |
| 2013 | National Wildlife Federation | 990 | Director | 3 | $0 | $0 | View return |