| 2022 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2021 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2020 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2019 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2018 | U C Santa Cruz Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2017 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2017 | U C Santa Cruz Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2016 | U C Santa Cruz Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 1 | $0 | $0 | View return |
| 2015 | U C Santa Cruz Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 5 | $0 | $0 | View return |
| 2014 | U C Santa Cruz Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 25 | $0 | $0 | View return |
| 2012 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 25 | $0 | $0 | View return |
| 2011 | Hierarchical Systems Research Foundation | 990PF | President/Treas./Scientist | 25 | $0 | $0 | View return |