| Center for Christian Virtue | — | Sep-Dec17 |
| Aaron Baer | Center for Christian Virtue | — | Sep-Dec17 |
| Barry G Sheets | Center for Christian Virtue | — | Sep-Dec17 |
| Joshua Brown | Center for Christian Virtue | — | May-Aug18 |
| Columbus City School District | — | May-Aug17 |
| Erik Roush | Columbus City School District | — | May-Aug17 |
| Department of Taxation | — | May-Aug18 |
| Ernest Massie | Department of Taxation | — | May-Aug18 |
| Gregory Siegfried | Department of Taxation | — | May-Aug18 |
| Joseph Testa | Department of Taxation | — | May-Aug18 |
| Margaret Sheehan | Department of Taxation | — | May-Aug18 |
| Marjorie Kruse | Department of Taxation | — | May-Aug18 |
| Matthew Chafin | Department of Taxation | — | May-Aug18 |
| Michael O'Leary | Department of Taxation | — | May-Aug18 |
| Nicholas Cipiti | Department of Taxation | — | May-Aug18 |
| Stanley Dixon | Department of Taxation | — | May-Aug18 |
| Timothy Lynch | Department of Taxation | — | May-Aug18 |
| Joshua Brown | First Freedom Ohio | — | May-Aug18 |
| Governor's Office | — | May-Aug17 |
| Beth Hansen | Governor's Office | — | May-Aug17 |
| Dawn Larzelere | Governor's Office | — | May-Aug17 |
| Merle Madrid | Governor's Office | — | May-Aug17 |
| Tim Biggam | Governor's Office | — | Sep-Dec17 |
| Wayne Struble | Governor's Office | — | May-Aug17 |
| Healthcare Distribution Alliance | — | May-Aug17 |
| Charles R Blasdel II | Healthcare Distribution Alliance | — | May-Aug17 |
| Joseph Erb | Healthcare Distribution Alliance | — | May-Aug17 |
| Institute for Principled Policy | — | Jan-Apr18 |
| Barry G Sheets | Institute for Principled Policy | — | Jan-Apr18 |
| Intuit, Inc | — | May-Aug17 |
| Ian Weir | Intuit, Inc | — | May-Aug17 |
| Office of Budget and Management | — | Jan-Apr18 |
| Frederick Church | Office of Budget and Management | — | Jan-Apr18 |
| Timothy S Keen | Office of Budget and Management | — | Jan-Apr18 |
| Ohio Society of Certified Public Accountants | — | May-Aug17 |
| Barbara J Benton | Ohio Society of Certified Public Accountants | — | May-Aug17 |
| Gregory Saul | Ohio Society of Certified Public Accountants | — | May-Aug17 |
| Lauren Huddleston | Ohio Society of Certified Public Accountants | — | Sep-Dec17 |
| Lisa Rankin | Ohio Society of Certified Public Accountants | — | Jan-Apr18 |
| Nathan Aichele | Ohio Society of Certified Public Accountants | — | Sep-Dec17 |
| Neil S Clark | Ohio Society of Certified Public Accountants | — | Sep-Dec17 |
| Ohioans for Tax Reform | — | Jan-Apr18 |
| John F Boyle, Jr | Ohioans for Tax Reform | — | Jan-Apr18 |
| Principled Policy Consulting, LLC | — | Sep-Dec17 |
| Barry G Sheets | Principled Policy Consulting, LLC | — | Sep-Dec17 |