Ohio Rev. Code Ann. § 4117.01
As used in this chapter:
(C) "Public employee" means any person holding a position by appointment or employment in the service of a public employer, including any person working pursuant to a contract between a public employer and a private employer and over whom the national labor relations board has declined jurisdiction on the basis that the involved employees are employees of a public employer, except:
(F) "Supervisor" means any individual who has authority, in the interest of the public employer, to hire, transfer, suspend, lay off, recall, promote, discharge, assign, reward, or discipline other public employees; to responsibly direct them; to adjust their grievances; or to effectively recommend such action, if the exercise of that authority is not of a merely routine or clerical nature, but requires the use of independent judgment, provided that: