operative
actor
agent
architect
author
conductor
creator
doer
driver
engineer
executant
executor
executrix
fabricator
functionary
handler
maker
manipulator
medium
mover
operator
performer
perpetrator
pilot
practitioner
prime mover
producer
runner
steersman
subject
worker
at-large
chamber music
clean-souled
demonstratemarket
hugger
juristic
lockean/jeffersonian
macroeconomic
on-the-job
operancy
patristic
supervise
synodical
trollish
inoperant