If you are the tenant of record and your roommate is not, and you would like your roommate to leave, and your roommate has been in the apartment for more than 30 days, and your roommate refuses to leave voluntarily, then, unfortunately, you have only one recourse -- a formal eviction proceeding. This writer does not prosecute (only defends) eviction proceedings. The law does not require that you be represented by a lawyer in Housing Court, and the Court provides assistance to parties without lawyers. However, without a lawyer it may be more difficult to get the results you want. There are many lawyers in the City of New York who make their living prosecuting eviction proceedings.