organizationist
/ˌɔːɡənʌɪˈzeɪʃ(ə)nɪst/ /ˌɔːɡ(ə)nʌɪˈzeɪʃ(ə)nɪst/Now rare
noun
Originally: a person who is an organizer for or an advocate of charity organizations. Only in charity organizationist. Now also: a person whose primary commitment is to the organization for which he or she works.
Origin
Late 19th century; earliest use found in The Pall Mall Gazette. From organization + -ist.