| 2024 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2024 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2024 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2024 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2023 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2023 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2023 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2023 | Nrdc Action Fund Inc | 990 | Vice Chair/Director | 1 | $0 | $0 | View return |
| 2023 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2022 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2022 | Efi Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2022 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2022 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2022 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2022 | Nrdc Action Fund Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2022 | Efi Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | Nrdc Action Fund Inc | 990 | Director | 1 | $0 | $2,150 | View return |
| 2021 | American Conservation Association | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2021 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2021 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2021 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2021 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2020 | Nrdc Action Fund Inc | 990 | Director | 1 | $0 | $15,480 | View return |
| 2020 | No Longer Empty Inc | 990 | Board Member | - | $0 | $0 | View return |
| 2020 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2020 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2020 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2020 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2020 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2020 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2019 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2019 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | No Longer Empty Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2019 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2019 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2019 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2019 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | Nrdc Action Fund Inc | 990 | Director | 1 | $0 | $33,973 | View return |
| 2018 | American Conservation Association | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2018 | No Longer Empty Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2018 | Adirondack Land Trust Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2018 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2018 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2018 | The Sperry Fund | 990PF | Director | 2 | $0 | $0 | View return |
| 2018 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | Prospect Hill Foundation Inc | 990PF | Director | 2 | $0 | $0 | View return |
| 2018 | Cary Institute of Ecosystem Studies Inc | 990 | Board Of Trustees | 1 | $0 | $0 | View return |
| 2017 | Nrdc Action Fund Inc | 990 | Director | 1 | $0 | $22,145 | View return |
| 2017 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2017 | American Conservation Association | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2017 | Clientearth USA Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2017 | Adirondack Land Trust Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2017 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Nrdc Action Fund Inc | 990 | Director/Former President | 1 | $0 | $31,820 | View return |
| 2016 | American Conservation Association | 990PF | Trustee | 0 | $0 | $0 | View return |
| 2016 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2016 | Clientearth USA Inc | 990EZ | Director | 0.5 | $0 | $0 | View return |
| 2016 | Adirondack Land Trust Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2016 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Adirondack Land Trust Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2015 | Natural Resources Defense Council Inc | 990 | Former President | 5 | $183,372 | $0 | View return |
| 2015 | Nrdc Action Fund Inc | 990 | Former President | 1 | $0 | $183,372 | View return |
| 2015 | American Conservation Association | 990PF | Trustee | 0 | $0 | - | View return |
| 2015 | Climate Central Inc | 990 | Board Member | 2 | $0 | $0 | View return |
| 2015 | Adirondack Land Trust Inc | 990 | Board Member | 1 | $0 | $0 | View return |
| 2015 | Meridian Institute | 990 | Director | 0 | $0 | $0 | View return |
| 2015 | World Resources Institute Fund | 990EZ | Director | 0 | $0 | $0 | View return |
| 2015 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2014 | Natural Resources Defense Council Inc | 990 | President (Thru 12/31/2014) | 40 | $440,198 | $0 | View return |
| 2014 | Nrdc Action Fund Inc | 990 | President (Thru 12/2014) | 1 | $0 | $440,198 | View return |
| 2014 | American Conservation Association | 990PF | Trustee | 0 | $0 | - | View return |
| 2014 | Meridian Institute | 990 | Director | 0 | $0 | $0 | View return |
| 2014 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2014 | World Resources Institute Fund | 990EZ | Director | 0 | $0 | $0 | View return |
| 2013 | Natural Resources Defense Council Inc | 990 | President | 40 | $422,811 | - | View return |
| 2013 | Nrdc Action Fund Inc | 990 | President | 1 | - | $422,811 | View return |
| 2013 | American Conservation Association | 990PF | Trustee | 0 | $0 | - | View return |
| 2013 | Meridian Institute | 990 | Director | 0 | $0 | $0 | View return |
| 2013 | Alliance to Save Energy | 990 | Member | 1 | $0 | $0 | View return |
| 2013 | World Resources Institute | 990 | Director | 1 | $0 | $0 | View return |
| 2012 | American Conservation Association | 990PF | Trustee | 0 | $0 | - | View return |