Kevin O’Sullivan, the Bridgehampton-based architect with a soft spot for modernism, arrived in New York 23 years ago, slightly by accident.

He had traveled to Singapore from Scotland, his native country, and stayed in Asia for five years. “I wrote down all the places I’d like to live in the world,” Mr. O’Sullivan said. “The one that won was New York. I got on a plane. I didn’t actually know anyone here, or have a job. It was 104 degrees colder than I was used to in Singapore.” Still, he had no trouble finding gainful employment. Within three days of his arrival, Mr. O’Sullivan had a position with the iconic Gwathmey Siegel Kaufman Architects.

Principal Charles Gwathmey, responsible for the 1992 renovation of New York City’s Guggenheim Museum, built the Robert Gwathmey residence in Amagansett in 1965, off Bluff Road. “It was the genesis for those 1980s spec houses that were cubes,” Mr. O’Sullivan said. “But that was the original modern house. It was a very small footprint. It was a weekender. And it’s still standing.” That house continues to loom large in Mr. O’Sullivan’s mind.

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