He formerly served as a New York City Council member , representing the 39th District in Brooklyn , which contains Borough Park , Carroll Gardens , Cobble Hill , Gowanus , Kensington , Park Slope , and Windsor Terrace .
Before that , he was a New York City Council member representing the 39th District in Brooklyn ( Borough Park , Carroll Gardens , Cobble Hill , Gowanus , Kensington , Park Slope , and Windsor Terrace ) .