Partner, Platt, Wyckoff and Coles, Architects, New York, NY; Geoffrey and his brother William Platt operated this successor firm to that of their father, Charles Adams Platt. The Platt Brothers did a small amount of design work in Seattle, WA.

Chair, Landmarks Preservation Commission, New York, NY, -1968; Vice-chair, Landmarks Preservation Commission, New York, NY, 1968- ;

Geoffrey Platt's father was the New York architect, Charles Adams Platt (1861-1933), who was well-known for his country house designs and many of their landscape gardens. His brother, William Platt, was also an architect.

In 12/1932, Platt married Helen Choate, 26, whom Time Magazine described as a "...Manhattan poetess, socialite, granddaughter of the late U. S. Ambassador to England Joseph Hodges Choate." (See "Milestones, Jan. 2, 1933,"Accessed 02/09/2011.)

Member, Municipal Art Society, New York, NY;

• Cornish, NH (Architect's Birth)
  Cornish, NH

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