A Connecticut resident who previously challenged the Defense of Marriage Act has filed suit against a major U.S. company in an attempt to collect pension benefits he claims he is owed following his partner’s death.

But Gerald Passaro is hardly the only person involved in legal proceedings stemming from the U.S. Supreme Court’s decision last year to strike down key portions of the law that denied a wide range of benefits to same-sex couples. Attorneys in practice areas ranging from immigration to tax law say they are working with clients on DOMA-related matters.