 He also held directorships in other companies, including the Brooklyn City Railroad and American Express.In March 1900, Pratt was re-elected a director of the United States Mortgage and Trust Company, to serve three years.Prior to 1923, he was a trustee of the Atlantic Mutual Insurance Company, president and director of The Thrift, and director of the Union Mortgage Company, Chelseai Fibre Mills, Hoagland Laboratories, Pratt & Lambert, Self-Winding Clock Company, and others.