| 2024 | American Friends of the Latvian National Museum Inc. | 990EZ | Treasurer & Secretary | 2 | $0 | $0 | View return |
| 2024 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2024 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Fund for the Endowment of the Diplomatic Reception Rooms of the Dept of State | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2023 | American Friends of the Latvian National Museum Inc. | 990 | Treasurer & Secretary | 0 | $0 | $0 | View return |
| 2023 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2023 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2022 | American Friends of the Latvian National Museum Inc. | 990EZ | Treasurer & Secretary | 2 | $0 | $0 | View return |
| 2022 | Fund for the Endowment of the Diplomatic Reception Rooms of the Dept of State | 990 | Trustee | 0.05 | $0 | $0 | View return |
| 2022 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2022 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2022 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2021 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2020 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2020 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2020 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2019 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2019 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2018 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | British Architectural Library Trust Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2017 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2017 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | British Architectural Library Trust Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2015 | British Architectural Library Trust Inc. | 990 | Director | 1 | $0 | $0 | View return |
| 2015 | Curtis Institute of Music | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2015 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2014 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | The College of Physicians of Philadelphia | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | J J Medveckis Foundation | 990PF | Trustee | 0.5 | $0 | $0 | View return |
| 2013 | Philadelphia Museum of Art | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | The College of Physicians of Philadelphia | 990 | Trustee | 1 | $0 | $0 | View return |