1) Any HR department 2) Boss 3) Boss, at times 4) Boss, often 5) Business owner, sometimes 6) Central casting 7) Chief of staff 8) Employer 9) Employer, at times 10) Employer, often 11) Employer, sometimes 12) Employing person 13) Employment manager 14) Engaging individual 15) Engaging one 16) Filler of a job opening 1) Guvnor 
• (n.) One who hires.
Hir'er noun One who hires.