조원(造園)기사 or 조경사 or 조경가

조경원: member of a landscape architecture office 조경가: landscape architect (generic) 조경사: landscape architect (officially certified professional) As you can see above, ~원 is someone who just happen to be working in that particular field/industry, probably without any kind of qualification whatsoever. ~가 on the other hand implies that this person is quite knowledgeable in that field. ~사 is someone who could be called ~가 holding a governmen issued certificate. e.g.: 교원 = people working at school, not necessarily teachers 교사 = teacher