Final answer:
A private college teacher is employed by an independent educational organization rather than a government-run institution, differentiating them from workers like public school principals and city library desk clerks.
Step-by-step explanation:
Workers in educational positions can be employed by either state/local governments or by independent organizations. The type of worker employed by an independent educational organization, as opposed to a government-run institution, is a private college teacher. While city library desk clerks, school district administrators, and public school principals are typically employed by state or local governmental entities, private colleges are not funded nor operated by the government. These institutions often rely on tuition, private contributions, endowments, and other funding sources that are not derived from tax dollars.