| Ductile Iron Pipe Research Association | — | May-Aug23 |
| Andrew Minton | Ductile Iron Pipe Research Association | — | Sep-Dec23 |
| Greg Bennett | Ductile Iron Pipe Research Association | — | Sep-Dec23 |
| William L Byers, IV | Ductile Iron Pipe Research Association | — | Sep-Dec23 |
| Ohio Department of Natural Resources | — | Jan-Apr24 |
| Ben Bruns | Ohio Department of Natural Resources | — | Jan-Apr24 |
| Nathan Moffitt | Ohio Department of Natural Resources | — | Jan-Apr24 |
| Ryan Frazee | Ohio Department of Natural Resources | — | Jan-Apr24 |
| Ohio Environmental Service Industries | — | Sep-Dec24 |
| Thomas P Pappas | Ohio Environmental Service Industries | — | Sep-Dec24 |
| William Schwartz | Ohio Environmental Service Industries | — | Sep-Dec24 |
| Ohio Township Association | — | May-Aug23 |
| Brooke A Cheney | Ohio Township Association | — | May-Aug23 |
| Heidi M Fought | Ohio Township Association | — | May-Aug23 |
| Kelsey Woolard | Ohio Township Association | — | May-Aug23 |
| Kyle Brooks | Ohio Township Association | — | May-Aug23 |
| Matthew S Whitehead | Ohio Township Association | — | May-Aug23 |
| Michael Guastella | Ohio Township Association | — | May-Aug23 |
| Ronald Romito | Ohio Township Association | — | May-Aug23 |
| Sydney Sanders | Ohio Township Association | — | May-Aug23 |
| Victor F Hipsley | Ohio Township Association | — | May-Aug23 |
| Andrew Minton | Public Employee Retirees, Inc | — | Jan-Apr24 |