The phrase "works for" implies employment, and there are several synonyms for it. One synonym is "is employed by," which suggests that the person receiving payment for their labor is directly affiliated with the organization or person who is paying them. Another synonym is "serves," which can be used in situations where someone is providing a specific service or working in a particular capacity for someone else. "Assists," "collaborates with," and "contributes to" are also possible synonyms, especially in professional or team-based environments. Ultimately, the choice of synonym will depend on the context of the situation and the relationship between the individuals involved.