| 2024 | Walker Community Betterment Association | 990PF | Treasurer | 10 | $0 | - | View return |
| 2024 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2023 | Iowa Great Lakes Association | 990EZ | Member | 1 | $0 | - | View return |
| 2023 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2022 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2022 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2021 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2020 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2020 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2019 | Greater Des Moines Botanical Garden | 990 | Director | 0.22 | $0 | $0 | View return |
| 2019 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2019 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2018 | Greater Des Moines Botanical Garden | 990 | Director | 0.28 | $0 | $0 | View return |
| 2018 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2018 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2017 | Greater Des Moines Botanical Garden | 990 | Director | 0.21 | $0 | $0 | View return |
| 2017 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2017 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2016 | Greater Des Moines Botanical Garden | 990 | Director | 0.13 | $0 | $0 | View return |
| 2016 | Simpson College | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2016 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2016 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2015 | Greater Des Moines Botanical Garden | 990 | Director | 2 | $0 | $0 | View return |
| 2015 | Simpson College | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2015 | Cornell College | 990 | Vice Chair, Blds & Grounds Policy | 3 | $0 | $0 | View return |
| 2015 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2015 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2014 | Greater Des Moines Botanical Garden | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | Simpson College | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2014 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2014 | Cornell College | 990 | Vice Chair, Blds & Grounds Policy | 3 | $0 | $0 | View return |
| 2014 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2013 | Greater Des Moines Botanical Garden | 990 | Director | 1 | $0 | $0 | View return |
| 2013 | Cornell College | 990 | Vice Chair Blds & Grounds/Trustee | 3 | $0 | $0 | View return |
| 2013 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2013 | Simpson College | 990 | Trustee | 0.5 | $0 | $0 | View return |
| 2013 | Naples Children and Education Foundation | 990 | Trustee | 1 | $0 | $0 | View return |
| 2012 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |
| 2009 | Thomas & Linda Koehn Foundation | 990PF | Secretary | 0.5 | $0 | $0 | View return |