| 2024 | Glyndebourne America Inc Co the Law Offices of Richard M Block | 990 | Director | 1 | $0 | $0 | View return |
| 2024 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2024 | Pierpont Morgan Library | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2023 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director Until 5/19/23 | 2 | $0 | $0 | View return |
| 2023 | Pierpont Morgan Library | 990 | Trustee | 1 | $0 | $0 | View return |
| 2022 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2022 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2022 | Pierpont Morgan Library | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2021 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2021 | Pierpont Morgan Library | 990 | Trustee | 1 | $0 | $0 | View return |
| 2020 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2020 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2019 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2019 | Pierpont Morgan Library | 990 | Trustee | 1 | $0 | $0 | View return |
| 2019 | Municipal Art Society of New York | 990 | Director (Through 12/19) | 1 | $0 | $0 | View return |
| 2019 | Metropolitan Opera Association Inc. | 990 | Managing Director To 7/2/20 | 1 | $0 | $0 | View return |
| 2018 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2018 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2018 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |
| 2018 | Municipal Art Society of New York | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2017 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2017 | Municipal Art Society of New York | 990 | Chairman, Director | 1 | $0 | $0 | View return |
| 2017 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |
| 2016 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2016 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2016 | The Mariinsky Foundation of America Inc. | 990 | Chairman (Until 11/2016) | 0.5 | $0 | $0 | View return |
| 2016 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |
| 2016 | Municipal Art Society of New York | 990 | Chairman | 1 | $0 | $0 | View return |
| 2015 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2015 | The Mariinsky Foundation of America Inc. | 990 | Chairman | 0.5 | $0 | $0 | View return |
| 2015 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2015 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |
| 2015 | Municipal Art Society of New York | 990 | Chairman | 1 | $0 | $0 | View return |
| 2015 | The Mariinsky Foundation of America Inc. | 990 | Chairman | 0.5 | $0 | $0 | View return |
| 2014 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2014 | The Mariinsky Foundation of America Inc. | 990 | Chairman | 0.5 | $0 | $0 | View return |
| 2014 | Helen Frankenthaler Foundation Inc. | 990PF | President/Director | 2 | $0 | $0 | View return |
| 2014 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |
| 2014 | The Mariinsky Foundation of America Inc. | 990 | Chairman | 0.5 | $0 | $0 | View return |
| 2014 | Municipal Art Society of New York | 990 | Chair | 1 | $0 | $0 | View return |
| 2013 | Friends of the Jewish Museum Berlin | 990 | Director | 0.5 | $0 | $0 | View return |
| 2013 | The Mariinsky Foundation of America Inc. | 990 | Chairman | 0.5 | $0 | $0 | View return |
| 2013 | Metropolitan Opera Association Inc. | 990 | Managing Director | 1 | $0 | $0 | View return |