| 2024 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2024 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2023 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2022 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2022 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2021 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2021 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2020 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2020 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2019 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2019 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2018 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2018 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2018 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2017 | Smaller Business Association of New England Inc | 990 | Member Direc | - | $0 | $0 | View return |
| 2017 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2017 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2016 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2016 | Smaller Business Association of New England Inc | 990 | Director | 1 | $0 | $0 | View return |
| 2016 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2015 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2015 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2014 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2014 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2013 | Museum of Science | 990 | Trustee | 1 | $0 | $0 | View return |
| 2012 | Siff Charitable Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2012 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2011 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |
| 2010 | Lawrence a & Joan E Siff Foundation | 990PF | Trustee | 1 | $0 | $0 | View return |