To be eligible to serve as a clerk, a person must have a minimum of 10 years of progressively responsible administrative experience in public service or business that provides a thorough understanding of organizational, procedural, and human aspects of managing an organization, and at least 3 of the 10 years must have been in a position of substantial management responsibility. An attorney may substitute the active practice of law on a year-for-year basis for the management or administrative experience requirement. Clerks do not have to be licensed attorneys, but some courts specify that a law degree is a preference for employment.