supervisor
(10) “supervisor” means an individual employed by an agency having authority in the interest of the agency to hire, direct, assign, promote, reward, transfer, furlough, layoff, recall, suspend, discipline, or remove employees, to adjust their grievances, or to effectively recommend such action, if the exercise of the authority is not merely routine or clerical in nature but requires the consistent exercise of independent judgment, except that, with respect to any unit which includes firefighters or nurses, the term “supervisor” includes only those individuals who devote a preponderance of their employment time to exercising such authority;