| 2024 | Nebraska State Historical Society Foundation | 990 | Director | - | $0 | $0 | View return |
| 2024 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2023 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2023 | Nebraska State Historical Society Foundation | 990 | Director | - | $0 | $0 | View return |
| 2022 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2022 | Nebraska State Historical Society Foundation | 990 | Director | - | $0 | $0 | View return |
| 2021 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2021 | Czech and Slovak Educational Center and Cultural Museum | 990 | Corp Sec. | 1 | $0 | $0 | View return |
| 2021 | Nebraska State Historical Society Foundation | 990 | Director | - | $0 | $0 | View return |
| 2020 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2020 | World Farmers Hall of Fame | 990PF | Treasurer | 1 | $0 | $0 | View return |
| 2020 | Czech and Slovak Educational Center and Cultural Museum | 990 | Corp Sec. | 1 | $0 | $0 | View return |
| 2019 | World Farmers Hall of Fame | 990PF | Treasurer | 1 | $0 | $0 | View return |
| 2019 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2019 | Czech and Slovak Educational Center and Cultural Museum | 990 | Corp Sec. | 1 | $0 | $0 | View return |
| 2018 | World Farmers Hall of Fame | 990PF | Treasurer | 1 | $0 | $0 | View return |
| 2018 | Czech and Slovak Educational Center and Cultural Museum | 990 | Corp Sec. | 1 | $0 | $0 | View return |
| 2018 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2017 | Czech and Slovak Educational Center and Cultural Museum | 990 | Corp Sec. | 1 | $0 | $0 | View return |
| 2017 | World Farmers Hall of Fame | 990PF | Treasurer | 1 | $0 | $0 | View return |
| 2017 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2016 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2016 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2015 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2015 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2014 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2014 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2013 | Nebraska State Historical Society Foundation | 990 | Director | 0.5 | $0 | $0 | View return |
| 2013 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2012 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2011 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |
| 2010 | World Farmers Hall of Fame | 990PF | Treasurer | 0 | $0 | $0 | View return |