A "managing member" is an individual who is responsible for overseeing and making important decisions for a business or organization. They have authority and control over the operations and management of the entity. Full definition
Despite that lack of experience, I was expected to immediately manage the members of my support staff, each of whom were older and more experienced than I was in the industry. (rocketlawyer.com)
Will work on facilitating a membership culture of learning and skill - building, overseeing regular print and electronic communications, proposing and executing strategies to expand member support, and managing member surveys. (flexjobs.com)
In other words, a CEO or manager or managing member of a company isn't allowed to speak for it in court. (law.stackexchange.com)