| 2024 | Stewart Family Foundation Inc. | 990PF | President | 40 | $111,000 | $0 | View return |
| 2023 | Old Town School of Folk Music Inc. | 990 | CEO | 40 | $251,077 | $0 | View return |
| 2023 | Stewart Family Foundation Inc. | 990PF | President | 40 | $96,000 | $0 | View return |
| 2022 | Rocky Mountain Institute | 990 | Managing Director Senior Exper | 40 | $351,170 | $0 | View return |
| 2022 | Old Town School of Folk Music Inc. | 990 | CEO | 40 | $219,708 | $0 | View return |
| 2022 | Stewart Family Foundation Inc. | 990PF | President | 40 | $96,000 | $0 | View return |
| 2022 | Society for Integrative & Comparative Biology Co Burk & Associates Inc | 990 | Director (Until 1/23) | 0.05 | $0 | $0 | View return |
| 2021 | Rocky Mountain Institute | 990 | Managing Director | 40 | $366,351 | $0 | View return |
| 2021 | Old Town School of Folk Music Inc. | 990 | CEO | 40 | $214,396 | $0 | View return |
| 2021 | Stewart Family Foundation Inc. | 990PF | President | 40 | $96,000 | $0 | View return |
| 2021 | Society for Integrative & Comparative Biology Co Burk & Associates Inc | 990 | Dnnsb Chair/Exec Comm | 0.05 | $0 | $0 | View return |
| 2020 | Rocky Mountain Institute | 990 | Managing Director | 40 | $359,708 | $0 | View return |
| 2020 | Old Town School of Folk Music Inc. | 990 | CEO | 1 | $219,673 | $0 | View return |
| 2020 | Stewart Family Foundation Inc. | 990PF | President | 40 | $96,000 | $0 | View return |
| 2020 | Society for Integrative & Comparative Biology Co Burk & Associates Inc | 990 | Dnnsb Chair/Exec Comm (From 1/21) | 0.05 | $0 | $0 | View return |
| 2019 | Rocky Mountain Institute | 990 | Managing Director | 40 | $368,917 | $0 | View return |
| 2019 | Rocky Mountain Institute | 990 | Managing Director | 40 | $368,917 | $0 | View return |
| 2019 | Old Town School of Folk Music Inc. | 990 | CEO- Beg. 2/19; Director Thru 2/19 | 1 | $176,789 | $0 | View return |
| 2019 | Stewart Family Foundation Inc. | 990PF | President | 40 | $40,000 | $0 | View return |
| 2018 | Rocky Mountain Institute | 990 | Managing Director | 40 | $351,476 | $0 | View return |
| 2018 | Stewart Family Foundation Inc. | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2018 | Old Town School of Folk Music Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | Rocky Mountain Institute | 990 | Managing Director | 40 | $310,592 | $0 | View return |
| 2017 | Stewart Family Foundation Inc. | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2017 | Old Town School of Folk Music Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Rocky Mountain Institute | 990 | Managing Director | 40 | $266,341 | $0 | View return |
| 2016 | Stewart Family Foundation Inc. | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2016 | Old Town School of Folk Music Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2015 | Port Jefferson Volunteer Firemens Benevolent Association Inc. | 990 | Past Secretary | 0 | $750 | $0 | View return |
| 2015 | Old Town School of Folk Music Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2014 | Rocky Mountain Institute | 990 | Managing Director | 40 | $261,685 | $0 | View return |
| 2014 | Port Jefferson Volunteer Firemens Benevolent Association Inc. | 990 | Secretary | 0 | $750 | $0 | View return |
| 2014 | Colorado Clean Energy Cluster | 990 | Director | 1 | $0 | $0 | View return |
| 2014 | Old Town School of Folk Music Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2013 | Rocky Mountain Institute | 990 | Managing Director | 40 | $216,270 | $0 | View return |
| 2013 | Port Jefferson Volunteer Firemens Benevolent Association Inc. | 990 | Secretary | 0 | $750 | $0 | View return |