He was born in Waterdown, Ontario, the son of Reverend Simeon Whidden Fisher and Mary Ingram, and was educated in Dundas, at Toronto University and at Osgoode Hall.
The Whidden–Kerr House and Garden, which was William Whidden's residence from 1901 until 1911, is also listed on the National Register.
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William Marcy Whidden (February 10, 1857 – July 27, 1929) was a founding member of Whidden & Lewis, a prominent architectural firm in Portland, Oregon, United States.