analyzer
assayer
behavior therapist
clinical psychologist
essayer
examiner
experimenter
headshrinker
hypnotherapist
narcotherapist
psychiatrist
psychoanalyst
psychoanalyzer
psychotherapeutist
psychotherapist
research worker
researcher
shrink
shrinker
test driver
test pilot
tester
tryer-out
administrator
adviser
banker
broker
commentator
consultant
developer
director
economist
engineer
executive
investor
journalist
lawyer
manager
scientist
specialist
strategist
technician
panelist