Ohio Rev. Code Ann. § 4113.03

In all actions brought to recover from an employer for personal injuries suffered by his employee or for death resulting to such employee from such personal injuries, while in the employ of such employer, arising from the negligence of such employer or any of such employer's officers, agents, or employees, it shall be held in addition to any other liability existing by law that any person in the employ of such employer, in any way having power or authority in directing or controlling any other employee of such employer, is not the fellow servant, but superior to such other employee; any person in the employ of such employer in any way having charge or control of employees in any separate branch or department shall be held to be the superior and not the fellow servant of all employees in any other branch or department in which they are employed; any person in the employ of such employer whose duty it is to repair or inspect the ways, works, boats, wharves, plant, machinery, appliances, or tools, in any way connected with or in any way used in the business of the employer, or to receive, give, or transmit any signal, instruction, or warning to or for such employees, shall be held to be the superior and not the fellow servant of such other employees of such employer.