Henry N. Cobb. Photo courtesy of Pei Cobb Freed & Partners

Henry N. Cobb, the groundbreaking architect and longtime collaborator with visionary designer I.M. Pei who crafted a well-known Stamford landmark, died yesterday at 93.

Cobb’s death was confirmed by his firm, Pei Cobb Freed & Partners in a post on its website. Cobb founded the firm along with Pei and architect Eason H. Leonard in 1955. Pei himself died last May.

“Over a career that spanned seven decades of sustained and brilliant accomplishment, his breadth of engagement and depth of insight guided generations of architects,” firm partners Michael D. Flynn, Ian Bader, Yvonne Szeto, Michael W. Bischoff and José Bruguera said in a statement. “Unwavering in his commitment to both attainment and restraint, Harry lifted our art to a definition of truth itself.”

Cobb’s many buildings included Stamford’s Pitney Bowes World Headquarters, now owned by Building and Land Technology. The building was one of the first developments in Stamford’s then-depressed Harbor Point neighborhood. In subsequent years, the building was joined by numerous multifamily and other developments that helped transform the city.