Wis. Stat. § 70.79: Power of supervisor of equalization.

If the reassessment is made by a person other than the supervisor of equalization of the county in which the district is located the supervisor of equalization has the same authority as in other assessments in the county and shall render assistance to the person making the reassessment and to the reviewing board and shall attend the meeting of the reviewing board. The district attorney of the county in which the reassessment is made shall give legal assistance in relation to the reassessment or the review upon the request of the supervisor of equalization.