- Brian De Palma was the filmographer at his wedding in 1974.
- Best known by many cult fans for his lead role as struggling songwriter Winslow Leach in the rock opera Phantom of the Paradise (1974).
- He taught in the Theatre Department of Sarah Lawrence College, which was headed by director Wilford Leach.
- He named his son after writer Dashiell Hammett.
- He was the same age with Brian De Palma and Paul Williams when they made Phantom of the Paradise (1974).
- Father of Dashiell Finley.
- Has English and Irish ancestry.
- He was born exactly one day after his Phantom of the Paradise (1974) co-star Paul Williams.
- Attended Sarah Lawrence College and Columbia University, which was where he met Brian De Palma.
- One of his colleagues at Sarah Lawrence College was future filmmaker Brian De Palma, whom he worked with on several student films.
- Attended and graduated from Columbia University in 1963.
- Parents were William Franklin Finley II and Dorothy Wainwright.
- Brother-in-law of Stanley Weiser.
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