 After admission to the bar, Breslin practiced in Albany as an associate in the firm of Garry Cahill & Edmunds, and then a partner in the reorganized Garry, Cahill, Edmunds & Breslin.In 1981, he began to practice in partnership with his brothers, Michael and Thomas creating the firm Breslin, Breslin, and Breslin.He later practiced as an "of counsel" attorney with the firm of Hiscock & Barclay.