| 2024 | Sigma Alpha Mu Fraternity Mu Psi Chapter | 990 | Treasurer | 15 | $0 | $0 | View return |
| 2023 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2023 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2022 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2022 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2021 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2021 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2020 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2020 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2019 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2019 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2018 | S & H Products | 990 | Trustee | 2 | $0 | $0 | View return |
| 2018 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2018 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2017 | S & H Products | 990 | Immediate Pa | 2 | $0 | $0 | View return |
| 2017 | Indian River Hospital Foundation Inc | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2017 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2017 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres, Dir, Sec | 1 | $0 | $0 | View return |
| 2016 | Indian River Hospital Foundation Inc | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2016 | S & H Products | 990 | Chairperson | 2 | $0 | $0 | View return |
| 2016 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2016 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres / Director / Sec | 1 | $0 | $0 | View return |
| 2015 | Indian River Hospital Foundation Inc | 990 | Treasurer | 3 | $0 | $0 | View return |
| 2015 | S & H Products | 990 | Vice-Chairpe | 2 | $0 | $0 | View return |
| 2015 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | $0 | View return |
| 2015 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres / Director / Sec | 1 | $0 | $0 | View return |
| 2014 | Indian River Hospital Foundation Inc | 990 | Director | 2 | $0 | $0 | View return |
| 2014 | S & H Products | 990 | Treasurer | 2 | $0 | $0 | View return |
| 2014 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | - | View return |
| 2014 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres / Director / Sec | 1 | $0 | - | View return |
| 2013 | S & H Products | 990 | Treasurer | 2 | $0 | $0 | View return |
| 2013 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | - | View return |
| 2013 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres / Director / Sec | 1 | $0 | - | View return |
| 2012 | Robert L and Frances J Zielsdorf Foundation | 990PF | VP | 1 | $0 | - | View return |
| 2012 | Robert L and Frances J Zielsdorf Foundation | 990PF | Pres / Director / Sec | 1 | $0 | - | View return |
| 2011 | Robert L and Frances J Zielsdorf Foundation | 990PF | Vice President | 1 | $0 | - | View return |
| 2011 | Robert L and Frances J Zielsdorf Foundation | 990PF | President / Director / Secretary | 1 | $0 | - | View return |
| 2010 | Robert L and Frances J Zielsdorf Foundation | 990PF | Vice President | 1 | $0 | - | View return |
| 2010 | Robert L and Frances J Zielsdorf Foundation | 990PF | President / Director / Secretary | 1 | $0 | - | View return |
| 2009 | Robert L and Frances J Zielsdorf Foundation | 990PF | Vice President | 1 | $0 | - | View return |
| 2009 | Robert L and Frances J Zielsdorf Foundation | 990PF | President / Director / Secretary | 1 | $0 | - | View return |