Neb. Rev. Stat. § 48-111

Such agreement or the election provided for in section 48-112 shall be a surrender by the parties thereto of their rights to any other method, form, or amount of compensation or determination thereof than as provided in the Nebraska Workers' Compensation Act, and an acceptance of all the provisions of such act, and shall bind the employee himself or herself, and for compensation for his or her death shall bind his or her legal representatives, his or her surviving spouse and next of kin, as well as the employer, and the legal representatives of a deceased employer, and those conducting the business of the employer during bankruptcy or insolvency. For the purpose of this section, if the employer carries a policy of workers' compensation insurance, the term employer shall also include the insurer. The exemption from liability given an employer and insurer by this section shall also extend to all employees, officers, or directors of such employer or insurer, but such exemption given an employee, officer, or director of an employer or insurer shall not apply in any case when the injury or death is proximately caused by the willful and unprovoked physical aggression of such employee, officer, or director.