Ohio Rev. Code § 4123.751
Any nonresident person, firm, or corporation of this state who engages in any activity or maintains any establishment in this state so as to be an employer, as defined in division (B) of section 4123.01 of the Revised Code, or any resident of this state, being an employer as so defined, who has engaged in any such activity or maintained any such establishment in this state, who subsequently becomes a nonresident or conceals his whereabouts, or, after due diligence, whose whereabouts cannot be ascertained and no forwarding address can be found, shall, by engagement in the activity or by maintenance of the establishment, make and constitute the secretary of state his agent for the service of process in any proceeding before the bureau of workers' compensation or the industrial commission or in any civil suit resulting therefrom, against the employer, arising out of or by reason of any injury or occupational disease as defined in this chapter, occurring within this state and involving employment in the activity or within the maintenance of the establishment.
R.C. §4123.751