MADISON, Wis. — The state’s elections and campaign finance law overseer has lost a key employee, and arguably one of its busiest during the past few years of Wisconsin’s high-stakes, partisan politics.

Shane Falk, staff counsel for the Government Accountability Board, resigned his position last week to take a job in private practice with an unidentified Madison law firm, according to a letter from GAB Elections Division Administrator Michael Haas.

The letter was dated Aug. 15.