About Us With headquarters in Portland, Maine, McCloskey, Mina & Cunniff, LLC is a law firm with a practice focused on complex civil litigation and white collar defense. The firm has broad experience representing parties involved in commercial disputes, employment claims, environmental accidents, constitutional litigation and serious injury and death cases. In addition, we are uniquely qualified to represent individual and institutional clients in matters involving alleged violations of federal and state laws pertaining to health care, taxation, customs, imports and exports, the environment, banking, securities, commercial fraud and high technology.