arranger — An arranger is a musician who arranges music by other composers, either for particular instruments or voices, or for a particular performance.
organizer — a person who organizes, especially one who forms and organizes a group.
promoter — a person or thing that promotes, furthers, or encourages.
assistant — Assistant is used in front of titles or jobs to indicate a slightly lower rank. For example, an assistant director is one rank lower than a director in an organization.
backer — A backer is someone who helps or supports a project, organization, or person, often by giving or lending money.
designer — A designer is a person whose job is to design things by making drawings of them.
helper — a person or thing that helps or gives assistance, support, etc.
