Ind. Code § 14-25-13-5

Sec. 5. In pursuance of Article 4 of the compact, there are five (5) commissioners on the Commission from Indiana. Each commissioner has all the powers conferred on a commissioner by the compact or which are necessary or incidental to the performance of the commissioner's functions as such a commissioner. The governor shall appoint the members of the Commission for terms of four (4) years. The governor shall fill by appointment any vacancies occurring in the office of a commissioner for any reason or cause for the unexpired term.