Cathy Tweedy knows luxury real estate in the Hamptons better than a Montauk fisherman knows tuna. She's witty, warm, and naturally curious—never showy, always sharp; and beneath that calm confidence is a powerhouse of expertise in Hamptons real estate.

After a notable career in Manhattan with advertising giant Ogilvy and a top-producing real estate career spanning decades in the Hamptons, Cathy blends urban sophistication with deep local insight. Her sensibility is cosmopolitan, her knowledge is local, and her clients—seasoned, savvy, and often repeat—trust her to lead the way.

She's been on every side of the deal: buyer, seller, developer, and landlord. That matters. It shows in how she positions a property, reads a market, or spots a hidden opportunity long before the pack. There's no fluff - just data, intuition, and timing.

Her marketing mind gives her an edge. Her style gives her staying power.

Cathy lives year-round in Sag Harbor with her loyal co-pilot, mini Goldendoodle, Rosie. A dedicated member of the East End community, she serves on the Board of the Ellen Hermanson Foundation and can often be found enjoying the local beaches when she's not showing or scouting properties.