John B. Foster was an American architect who was active in the early 20th century. He was born in 1872 in Massachusetts and studied architecture at the Massachusetts Institute of Technology. He worked in the offices of several prominent architects in Boston before opening his own practice in 1905.

Foster was known for his work in the Beaux-Arts style, which was popular in the early 20th century. He designed a number of public buildings, including the Boston Public Library, the State House Annex, and the Massachusetts State House. He also designed a number of private residences, including the Charles River Park Apartments and the Charlesgate Hotel.

Foster was a member of the American Institute of Architects and served as president of the Boston Society of Architects. He was also a member of the Boston Art Commission and served as its president from 1921 to 1923.

Foster was a prolific architect who designed a number of important buildings in the Boston area. His work was characterized by its attention to detail and its use of classical elements. He was a leader in the Beaux-Arts style and his work had a lasting influence on the architecture of the city.

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