| 2025 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2025 | Puente a La Salud Comunitaria | 990EZ | Treasurer | 2 | $0 | $0 | View return |
| 2024 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $264,992 | $25,992 | View return |
| 2024 | Tinker Foundation Incorporated | 990PF | Secretary | 0.5 | $4,000 | $0 | View return |
| 2024 | Puente a La Salud Comunitaria | 990EZ | Treasurer | 2 | $0 | $0 | View return |
| 2024 | Aspen Community Foundation | 990 | Board Member | 2 | $0 | $0 | View return |
| 2024 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2024 | The Aspen Country Day School Inc | 990 | Trustee | 2 | $0 | $0 | View return |
| 2024 | Environmental Defense Fund Incorporated | 990 | Vice Chair | 2 | $0 | $0 | View return |
| 2023 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $254,800 | $18,069 | View return |
| 2023 | Tinker Foundation Incorporated | 990PF | Secretary | 0.5 | $4,000 | $0 | View return |
| 2023 | Aspen Community Foundation | 990 | Board Member | 2 | $0 | $0 | View return |
| 2023 | Puente a La Salud Comunitaria | 990EZ | Treasurer | 2 | $0 | $0 | View return |
| 2023 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2023 | The Aspen Country Day School Inc | 990 | Trustee | 2 | $0 | $0 | View return |
| 2023 | Environmental Defense Fund Incorporated | 990 | Vice Chair | 2 | $0 | $0 | View return |
| 2022 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $265,000 | $2,754 | View return |
| 2022 | Puente a La Salud Comunitaria | 990EZ | Treasurer | 2 | $0 | $0 | View return |
| 2022 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2022 | Environmental Defense Fund Incorporated | 990 | Vice Chair | 2 | $0 | $0 | View return |
| 2021 | The Cynthia & George Mitchell Foundation | 990PF | Chair/President | 40 | $67,606 | $19,200 | View return |
| 2021 | The Philanthropy Workshop Inc | 990 | Member | 10 | $0 | $0 | View return |
| 2021 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | $0 | View return |
| 2021 | Puente a La Salud Comunitaria | 990EZ | Treasurer | 3 | $0 | $0 | View return |
| 2021 | Environmental Defense Fund Incorporated | 990 | Vice Chair | 2 | $0 | $0 | View return |
| 2020 | The Cynthia & George Mitchell Foundation | 990PF | Pres/Chair | 40 | $453,746 | $3,176 | View return |
| 2020 | The Philanthropy Workshop Inc | 990 | Vice Chairman | 10 | $0 | $0 | View return |
| 2020 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2020 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | - | View return |
| 2020 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2019 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $209,085 | $20,489 | View return |
| 2019 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | - | View return |
| 2019 | Affirmations Community Center | 990 | Director | 2 | $0 | $0 | View return |
| 2019 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2019 | National Center for Family Philanthropy Inc. | 990 | Chair (Thru 9/19) | 1 | $0 | $0 | View return |
| 2019 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2018 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $196,500 | $24,066 | View return |
| 2018 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2018 | Endowment for Regional Sustainability Science | 990PF | Director | 0.5 | $0 | - | View return |
| 2018 | National Center for Family Philanthropy Inc. | 990 | Chair | 1 | $0 | $0 | View return |
| 2018 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2017 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $196,500 | $24,066 | View return |
| 2017 | National Center for Family Philanthropy Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2017 | Endowment for Regional Sustainability Science | 990PF | Director | 0 | $0 | - | View return |
| 2017 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2016 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $190,212 | $28,366 | View return |
| 2016 | National Center for Family Philanthropy Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2016 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2016 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2015 | The Cynthia & George Mitchell Foundation | 990PF | President | 40 | $183,945 | $19,932 | View return |
| 2015 | National Center for Family Philanthropy Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2015 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2015 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2014 | Puente a La Salud Comunitaria | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2014 | National Center for Family Philanthropy Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2014 | Association of Small Foundations | 990 | Member | 2 | $0 | $0 | View return |
| 2014 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2013 | The Cynthia & George Mitchell Foundation | 990PF | President/Di | 40 | $147,062 | $8,044 | View return |
| 2013 | National Center for Family Philanthropy Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2013 | Puente a La Salud Comunitaria | 990 | Sec/Treasurer | 3 | $0 | $0 | View return |
| 2013 | Association of Small Foundations | 990 | Member | 2 | $0 | $0 | View return |
| 2013 | The Philanthropy Workshop Inc | 990 | Director | 0.5 | $0 | $0 | View return |
| 2013 | Environmental Defense Fund Incorporated | 990 | Trustee | 2 | $0 | $0 | View return |
| 2012 | The Cynthia & George Mitchell Foundation | 990PF | President/Di | 40 | $133,285 | $7,937 | View return |
| 2012 | Endowment for Regional Sustainability Science | 990PF | Director | 0 | $0 | $0 | View return |
| 2011 | The Cynthia & George Mitchell Foundation | 990PF | President/Di | 40 | $80,048 | $3,709 | View return |
| 2011 | Endowment for Regional Sustainability Science | 990PF | Director | 0 | $0 | $0 | View return |
| 2010 | Endowment for Regional Sustainability Science | 990PF | Director | 0 | $0 | $0 | View return |
| 2010 | The Cynthia & George Mitchell Foundation | 990PF | Director | 0 | $0 | $0 | View return |