About KOSA

Modern Hamptons Architect


Born in Scotland, Kevin O’Sullivan is the principal of Kevin O’Sullivan and Associates, an architectural design company based in New York City and the Hamptons. The firm serves a variety of client needs including architectural and interior design for city and country homes, as well as custom furniture.
Kevin earned his architectural Honors degree in Scotland at the University of Edinburgh. Prior to forming Kevin O’Sullivan and Associates in 2001, Kevin apprenticed at internationally renowned architecture firms, including Michael Hopkins and Partners in London, DP Architects in Singapore and Gwathmey Siegel and Associates in New York.
Kevin’s education and international experience have enabled him to integrate classical proportions with contemporary design styles. His work reflects over twenty years of experience and his desire to support sophisticated lifestyles with the best of classical European forms, contemporary materials, and subtle design elements.


A Southampton native, Luke Ferran holds a five-year Bachelors of Architecture degree from the New York Institute of Technology. During his career in architecture, Luke has worked for firms in both San Francisco and New York, giving him a wide range of knowledge in different building methods and typologies. Prior to his position as the senior project manager at Kevin O’Sullivan & Associates, Luke was a project manager at Blaze Makoid Architecture and the Director of Architecture for Elle Décor A-List member Robert Stilin. Luke documents in-progress KOSA work as well as his adventures in parenting on his Instagram page.