| 2024 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 40 | $0 | $0 | View return |
| 2024 | Climate Central Inc. | 990 | Trustee | 2 | $0 | $0 | View return |
| 2024 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2024 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2023 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 40 | $0 | $0 | View return |
| 2023 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2023 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2023 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2023 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2023 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2023 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2022 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2022 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 40 | $0 | $0 | View return |
| 2022 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2022 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2022 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2022 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2022 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2021 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 40 | $0 | $0 | View return |
| 2021 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2021 | High Meadows Fund Inc | 990 | Chair | 2 | $0 | $0 | View return |
| 2021 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2021 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2021 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2021 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2021 | High Meadows Fund Inc | 990 | Chiar | 2 | $0 | $0 | View return |
| 2021 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2020 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 40 | $0 | $0 | View return |
| 2020 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2020 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2020 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2020 | High Meadows Fund Inc | 990 | Chair | 2 | $0 | $0 | View return |
| 2020 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2020 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2020 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2019 | High Meadows Fund Inc | 990 | Board Chair | 2 | $0 | $0 | View return |
| 2019 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2019 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | High Meadows Institute Inc. | 990PF | Chairman/Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2019 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2019 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2019 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2019 | Environmental Defense Action Fund | 990 | Director | 4 | $0 | $0 | View return |
| 2018 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2018 | High Meadows Institute Inc. | 990PF | Treasurer/Director | 0.15 | $0 | $0 | View return |
| 2018 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2018 | High Meadows Fund Inc | 990 | Board Chair | 2 | $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 Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2018 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2018 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2017 | Wilderness Society Action Fund | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | High Meadows Institute Inc. | 990PF | Treasurer/Director | 1 | $0 | $0 | View return |
| 2017 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2017 | High Meadows Fund Inc | 990 | Board Chair | 2 | $0 | $0 | View return |
| 2017 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2017 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2017 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2016 | Telluride Foundation | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | High Meadows Fund Inc | 990 | Board Chair | 2 | $0 | $0 | View return |
| 2016 | High Meadows Institute Inc. | 990PF | Treasurer/Director | 1 | $0 | $0 | View return |
| 2016 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2016 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2016 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2016 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2016 | Environmental Defense Fund Incorporated | 990 | Chair | 6 | $0 | $0 | View return |
| 2015 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2015 | High Meadows Fund Inc | 990 | Board Chair | 2 | $0 | $0 | View return |
| 2015 | High Meadows Institute Inc. | 990PF | Treasurer/Director | 1 | $0 | $0 | View return |
| 2015 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2015 | Environmental Defense Fund Incorporated | 990 | Chair | 2 | $0 | $0 | View return |
| 2015 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2014 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2014 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2014 | High Meadows Institute Inc. | 990PF | Treasurer/Director | 1 | $0 | $0 | View return |
| 2014 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 20 | $0 | $0 | View return |
| 2014 | The Wilderness Society | 990 | Gov Council Member | 2 | $0 | $0 | View return |
| 2014 | Environmental Defense Fund Incorporated | 990 | Chair | 2 | $0 | $0 | View return |
| 2014 | North Bennet Street School | 990 | Member | 5 | $0 | $0 | View return |
| 2014 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2013 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 20 | $0 | $0 | View return |
| 2013 | The Woodrow Wilson National Fellowship | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2013 | Climate Central Inc. | 990 | Board Member | 2 | $0 | $0 | View return |
| 2013 | Environmental Defense Action Fund | 990 | Director | 2 | $0 | $0 | View return |
| 2013 | Environmental Defense Fund Incorporated | 990 | Chair | 2 | $0 | $0 | View return |
| 2013 | North Bennet Street School | 990 | Member | 5 | $0 | $0 | View return |
| 2013 | The Wilderness Society | 990 | Gov Council Member (From Oct '13) | 2 | $0 | $0 | View return |
| 2012 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 20 | $0 | $0 | View return |
| 2011 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 5 | $0 | $0 | View return |
| 2010 | High Meadows Foundation Co Carl Ferenbach | 990PF | Trustee | 1 | $0 | $0 | View return |